Tweetkeep the pin straight, inject at a slow rate. I did all of this wrong once when i was in a hurry, jammed the fucker in slanted, tried bending it back in p´lace, which hurt so bad I had to make a quick injection for the pain to stop, well instead i hurt for days and had a vastus lateralis that looked like tom platz's, if u know what I mean..hehehe mine was black and blue tho