First SubQ Injection (Rookie Question)

I know this is a rookie question, but I've always injected into glute or intramuscular, but I've taken a long break recently and decided to try out the peptide hexarelin. It is injected Subcutaneously, but I've never actually done subQ injections. From everything I can find, its fairly simple, but the only problem I seem to have is that I read if its injected into fat, it can form an air bubble and not absorb. Assuming I'll be doing most of my injections around my abdomen, my basic question is, should I be inserting the entire needle or just a bit into the upper layer of fat past the skin?

This is how you inject subq. Just inject slowly into the folded skin and you wont have issues. Also gently rub the injection site when you done.