They have instruction on the back for where to cut how to apply and you can also look up the brand name items on YouTube they have videos for them as we'll they are called violent lips. These depending on how you apply them can last anywhere between 4-8 hours. I wore some that stayed overnight but were hell to get off. I personally used rubbing alcohol to get it off and it worked perfectly....water not so much. And yeah depending on how you cut it, if done correctly you barely notice it. If you don't cut enough it will peel on you. :)