I'm rather new to stickering, but have devised some tricks as well as rules of thumb for those who wish to get into that sort of activism as well. This is intended to be a somewhat fluid list, and I’ll update it for as long as I’m able to edit the original post. You can choose to follow as many or as few things on the list as you want, but I think that most of them are generally a good idea.
First things first: check your local area's laws regarding stickers. Do they count stickering as graffiti? What is the punishment like for those caught; is it a fine, and if so, how expensive?
Obtaining stickers: there are multiple ways to do this. You can buy labels from stores such as Target and Amazon and write phrases on them, or make higher-quality stickers with a machine. If you want to support other women, stickers can also be found at online shops such as Adult Human Female, The Sticker Woman, Wild Womyn Workshop, Woman for Women on Gumroad, and @Shiloh here on Ovarit (sorry for the notification).
What is your area's climate like? Warm and dry, or humid, or rainy? I have used labels in my stickering so far, but I've noticed that even after a couple of hours in sunlight, they begin to peel, so this method should be saved for protected outdoor areas, or inside. Get weather/waterproof stickers when possible, or find material for this if you're making your own.
Making your own stickers: things to consider. If you're writing phrases on to labels, use markers or colored pens that will make an otherwise white rectangle stand out. In addition, if you live in an area where many residents speak more than one language, or where English is not the primary language, you may want to consider writing out your phrases in the other language(s). For help with translation, it's best to ask fluent speakers of the language rather than rely on online translators.
Is your intention to peak people? When transactivists attack women at any sort of event, it tends to cause an uptick in posts made to Twitter with the "#LetWomenSpeak" tag, many of which share photos and videos of the violence. If you make your own stickers or labels, consider making some with this tag.
Scout out the area(s) you plan to sticker. Look for surfaces such as poles, benches, bus stops, etc. How busy are these locations? Are there a lot of security cameras? Consider saving certain stickers for single-sex spaces like restrooms and locker rooms, as you are less likely to run into a security camera and you can do consciousness-raising at the same time.
While scouting an area, look for stickers which other people have placed. Make note of them and look for them the next time you walk through the area. This could give you a general idea of how long stickers in the area stay up without the city taking them down. This doesn’t account for TRAs scratching them out - but even if they’re not prevalent in your area, what’s the point in putting up a sticker only for a city worker to take it down the next day?
Know the demographics of the area(s) you wish to sticker in. Do you live in a neighborhood where abortion clinics are routinely protested? Save your pro-choice stickers for that location. College campus? Perhaps gender critical phrases for that location. This stands true for events which are set to take place in a specific location as well - if pro-lifers or TRAs are planning a protest, go around placing related stickers the night before or in the hours leading up to the event.
Carry hand sanitizer. If you plan on doing a lot of stickering in one day, that means you'll likely be touching a lot of surfaces that other people touch. You don't know whose hand has been where.
Avoid stickering on peoples' yard fences, memorial benches, around playgrounds, etc. Don't cover accessibility features (such as Braille) either. Respect the natural environment; don't put stickers on things like trees.
If you plan on lingering around a certain location for a while, don't place stickers immediately. For example, public transit - if you plan to stay on the bus or train for a while, don't place them right away; instead, wait until the stop before yours, or until you get off, to do this.
Speaking of public transit: this may be specific to my city, but I've noticed that placement of security cameras in buses tends to vary wildly between different makes/models. Be aware of this.
You can share photos of your stickering online if you please, but be careful about revealing your location. Blur or crop out things like street or business names in the image, particularly if you live in a smaller town.
Keep tabs on the areas that you place stickers in. How long does it take for them to get scratched out, or written/stickered over? Which phrases tend to attract the most attention?
And of course, have fun. Try out that coffee shop you always wanted to go to, and sticker in the area around it. Make a BINGO sheet for the things TRAs might sharpie over your stickers. If there's another woman stickering in the area, have friendly competition to see whose stickers stays around the longest.
If you have your own thoughts on any of these or your own tips, feel free to share!
Definitely look at local laws. Ik my city treats vandalism on transit VERY seriously, it is a felony, but the busses are vandalism and sharpie free. But if it's treated a bit less serious where you are just make sure to pay cash and not a prepaid card or ticket!
As a stickerer, these are very good tips.
Honestly I never even considered making my stickers multilingual, and I live in a very diverse city.
Unrelated, but if you have a lot of packages to send while you're out, the online USPS store offers packs of priority mail address labels that they will ship to you for free. Packs of ten and you can get up to 75 packs at once, but really, don't request more than you'll need to send your mail. They have more white space on them now than they used to.
Thanks!
I have also considered simply placing commercially-available Harry Potter-themed stickers under TRA stickers. They are readily available, good quality, and often have waterproof materials. It somehow feels less risky than stickers with explicit political messages, but still sends a message to the TRA sticker posters.