I have never done the aspirate step before injecting. If I only do it in the glutes is their much chance ill hit a vain. Ive read all the info on it but im still a little unclear what to do if i do draw blood. dont you have to through it all away if you do. and how far do you really have to draw back to actually see if you have hit a vain. I mean I dont think i could see blood unless i drew back prety far.