Done my first pin the other day and had a shocker. Injecting into thigh ad as I was going on I had a slight muscle twitch, then I aspirated and only a little amount of blood came up. So I took it out, changed pins and relocated to other thigh. My question is, how hard do you pull back? How deep do you go in with a 1 1/4 pin? Can you re inject a small amount of blood in a different spot? And what would happen if you went right through a nerve or graze it (which I think I did). Does it heal or is it long term?