What kind of problems are you having to get it on? You can go to hobby lobby and look for what they call a brayer, its bascally a roller with a rubber compound on it. Can use it to roll over the peel adn stick to lay out flat, or find type of something like a old experied creadit card to get all teh air bubble out.
I used gull sheet shipping labels print on it, peel and stick, covered in clear packing type 2 reason, to keep the ink from smearing and for me allows me to gripe to project to move, without tape my fingers slide to easy on the paper.