Don't be afraid. Start small and don't sweat it. Some things I do for myself is #1 put on some good music #2 wear some gloves or whatever is best for you to grip the fabric. It really does make all the difference. #3 Have fun with it! If this is something that you really want to do you will learn as you practice & will surprise yourself to no end. =) EnjoY!
I didn't have good luck with the slider...But I do like the vinyl cling stuff...but I also did it without anything.