I find I have more trouble on practice pieces than quilts. I think it is because the practice piece is small and you can't grasp as well. If you have some fabric you can waste try making a larger piece and see if that helps. I was going to give up and then one day it just started looking good. I am on my second wall hanging on a wholecloth with just fmq and I love it. Give it more time before you give up.
I also learned from a Craftsy class with Ann Peterson that she uses cupboard lining that is like rubber and grippy. You just cut a couple squares and use instead of gloves. I find it is easier for me with that. The gloves just didn't work for me.