in the years i've been pinning i've always done the following:
- never reused a needle or barrel
- always tore open a new BD syringe with needle to draw and a new one to pin
- swabbed the vial and injection spot (before and after for both)
- aspirated
you can never, ever, ever be too careful with those details. if you're going to fuck up on diet or training that's one thing, but to skip on good injection practices is just plain stupid.
be smart! GPZ all the way
+ 50 -- i follow the exact same and no issues