I was doing some reading on the newbie info, is it necessary to lets say when you aspirate and you see blood you have to grab a new needle and do the process all over again or can I re inject again but in a different spot? Also, it was talking about warm water and the oil so it can inject smoother but it didn't go into detail on how to do it, so do I boil water and put the vial above it or how? lol thanks in advance