a friend asked this q this morning and i mentioned i have Tips and Tricks (TM), which they asked me for also, so i figured i would put them here
use the glossy sticker paper. i used up the last of my matte sticker paper and bought the glossy of the same brand and the stickers ive been making are A LOT nicer
2. the printer settings matter a lot
use the print command screen to change settings always always always
you get here by clicking the "print/er properties" or "print command" button (or something similar). it should look like an old school windows screen (greige)
use the "photo paper" setting on "glossy photo paper" paper type on "high" quality AND MAKE SURE THE PAPER SIZE IS CORRECT, it'll likely default to 4x6" and you need 8.5x11" (for standard american copy paper size)
this should select borderless printing by default which will make it a lot easier to deal with print margins. if it doesnt, select borderless printing
3. speaking of margins, spread your designs out on your sheet a leeeetol more than you think you should, itll make cutting them out a lot easier
4. i have not made stickers out of like, raster images yet, but i wager its probably reeeaaalll important to know the difference between raster and vector images. tldr raster images are static in that the size they are made at is the size they look best at, and can thus look funky shrunk or blown up too much. vector images can be scaled or resized basically indefinitely without looking weird. doing stickers as vectors is "better" for a lot of things because its a lot easier to tweak sizes and keep it looking nice, but ymmv. i'm not your mom do what you want
5. idk about other art programs, but affinity's grouping function is baller because i can group and group that group with other groups, until i have groups of all of the things on my sticker sheet, and then i can take that whole group and center it on my page for printing
6. the second layer of holo film i feel is very important, folks have said my stickers are remarkably hardy because of it (waterproofness not withstanding). reviews ive read of holo film that you can print directly on say that the image is easy to scratch off, and ive had similar issues of stickers wearing off when printed just on the (glossy) sticker paper. the addition of the holo film is a pain in the ass but worth it
7. speaking of: tips for applying the holo film
work in chunks. cut your sticker sheet at least in half (hamburger style) tho depending on the size of the sticker i sometimes do down to quarter sheets. this makes the application of the holo film a lot easier and a lot less stressful, cos if you fuck up, you fuck up with fewer stickers, and you WILL fuck up
obvs, cut the holo film in size to match your sticker sheet. i try to do a smidge bigger, especially if i've trimmed down the margins/blank space
also, highly recommend a slicey paper cutter for this part. also highly recommend wiping down both the cut down stickers and the holo film with a dry cloth (or your pant leg) because there WILL be paper dust all over and you dont want that trapped under the holo film
go one cut down section at a time. peel one short edge back about an inch, gently bending the backing paper under. take the holo film by each exposed corner and bend it up just a little bit so the whole thing looks kind of like the aries symbol. line the holo film up with your stickers and attach the exposed end. gently press down as you also gently pull the backing paper away, going bit by bit very slow (VERY SLOW). press as you go, rubbing back and forth, until the backing paper is fully removed and the sticker paper is applied, you should be pressing the backing paper off, if that makes sense
if you have small bubbles, you can usually work them down by rubbing the holo vinyl with your fingers. youlll probably need to apply a fair bit of pressure, but, ykno, be gentle so you dont scratch it
if you have BIG bubbles, sometimes they can be fixed when you cut the stickers out. not always, but sometimes
if the holo vinyl wrinkles, your s-o-l. this is why i recommend cutting the sheets down to apply and to go slowly. TRUST ME and my box of fucked up wrinkly stickers
if you fuck up, people love free stuff. i just let people pick from my box of janky things when they buy at my booths, basically no one ever says no
7. for cutting things out, use sharp scissors and go slow. its a practice thing mostly but!
for curves: turn the sticker, not the scissors
for sharp inward corners: cut to the inner corner point, then back up a bit to cut a curve towards the rest of the cut line. you'll have a small triangle of stuff to cut away still. this is on purpose. once youve cut the whole thing out, youre gonna go back to that triangle. flip your sticker over, trust yourself, and follow the lines of your previous cuts. you should be using the line of the cut leading into the scissors to get to the point where you stopped in the inner corner. use the deeper part of the scissors, not the tips. go slloooooowwww. once you get to where you had previously cut, you'll feel a little thunk. stop and you should have a nice sharp, tight corner.