Correct nurses don't aspirate. But I promise u fail the practical if u don aspirate lol.
I almost always aspirate even on one handed shots like in delts. I do it for fun an cuz It makes me feel like a pro
I always go thru a check list :
Tricepts are easy to pin. My favorite site to pin.
Heat your gear in the sysringe under hot water and use a hot compress on the injection site
I wouldn't recommend biceps with a short ester. That will hurt like a B*tch. Try pecs and lats they are both easy and big muscles.
Check to see if your source uses EO (ethyl oleate). I used that **** and it destroyed my inj sites. I couldn't life for over a week. Threw it out and got non-EO gear from same source and very minimal pain. Some people like myself are horribly allergic to it.