Nervous about transition to G7

I am struggling with the idea of being forced into using the g7. I have tried it before and hated it becuase it never lasted the full duration due to me sweating and it falling off. I wore it on my arm but wondering if I can put it on my stomach?

I wear the g6 there and never have issues. I am just really upset and nervous about this. Any advice on how to make them stick would be greatly appreciated!