LOL @ Raw Lifter.........
Softly draw back on the plunger for 1-3 seconds to see if blood appears. If it does, this means you are sitting in a blood vessel and this is not good. Simply remove the needle, discard the needle and solution and start over again.
Upon no blood appearing after aspiration, inject solution very slowly (1ml/min). The slower the injection, the less the trauma to the muscle tissue and the less the discomfort you will feel.