I am almost finished unmounting all of mine. I went back and forth for months over it and finally decided to just do it
I took the entire stamp, foam and all, off the block. I never had to microwave them, they all pretty much peeled right off without a hitch. I took the sticker off the block and stuck it to the foam and cut around when needed. I used ZIG 2 way glue to "sticky" them and found out about midway through that I should have put some glue between the foam and the sticker as well. Once I started doing that, they were perfect. I am sure you will get lots of responses as there are so many ladies that have unmounted and they all have their preferred method.