Glitter Galore, here is a tip: after sticking the rubber to your ez mount (or whichever cushion you are using), powder the entire surface. This will avoid gucking (spelling?) up the hot knife. The powder cleans off the stamps very easily. Oh, and I use a glass mat when I am cutting, so the blade will not damage my surfaces.
Don't be nervous! It is fun and worth doing. Just remember to stay in a well ventilated area ('cuz it will smell a bit).