PLEASE READ CAREFULLY AS WE ARE NOT RESPONSIBLE FOR DAMAGE TO STICKERS DURING INSTALL.
Sticker application is a simple yet sometimes difficult thing!
With diecuts (especially specialty finishes like oil slick & sparkle,) you'll need to be extremely careful to make the the sticker stick to the transfer paper.
The best way I have found to do this and is recommended by AWStickers is as follows.
FLIP TIP: To get the vinyl apart from the backing, simply flip the vinyl over so that the letters are now facing down with the back of the liner face up. SLOWLY peel the liner while having pressure on the back of the sticker. Sometimes small pieces wont attach to the transfer paper, to fix this pressure back down on the sticker and peel that part again. With Oil Slick/Sparkle finishes it can be more difficult - Patience is KEY!
Using a squeege is recommended but definitely not needed.
Here is a visual guide from https://www.carstickers.com/sticker-application-instructions/