Be careful, Gary. Once you get hooked on watching your realtime blood glucose, it can be a difficult habit to break! 
I think these devices are one of the best educational tools to teach you about you. That’s if you want to pay attention, of course.
I recommend that you use hot water, soap, and a wash rag to thoroughly clean and scrub the prospective site. When you dry with a clean dry towel, slightly abrade your skin. Not to overdo it, just turn the skin slightly red.
I would then apply the Libre per directions and maybe paint some liquid Skin-Tac over the top and around the edges of the fabric bandage. If you use Skin-Tac, just don’t aggressively move or stretch the underlying skin while it dries.
There are many different over-taping techniques, and I’ve read many comments, but have not tried any of them. If you do a search LIbre flash glucose monitor and over-taping, I think you’ll be inundated with ideas.
I just read a long (read dozens of replies) on a Facebook group about this topic. Good luck!
Here’s one of dozens of threads here that explore getting devices to stick and stay: