I spray glue only.
There is a trick to it though, As I am sure you know, it can be a complete pain to get the pattern off sometimes.
To prevent this i spray the glue but a super super thin amount. Maybe 1 second for the entire pattern. it should not look wet.
Then i let it sit for at least 15 minutes. It should be just barely tacky, way less tacky than a post it note, way less. Almost like its not tacky at all.
Put it right on,. It will stay in place for the sawing and will come right off when done. Takes a bit of practice but once ytou get it down you will swear by it.