There is a risk of infection with every injection. Also drug addicts shoot up in public bathrooms while living on the streets.
My process.
1) wash hands
2) pull out my vial, syringe, drawing needle/point and my injection needle/point and 2 alcohol wipes.
3) wipe vial top until I see it is wet
4) wipe down a large section where I'm going to inject.
5) split the wrapper on the syringe and draw in the same volume of air as I will inject. 0.1 mL/cc
6) remove from wrapper and split my point I will draw with.
7)pull in just enough air to clear the point.
8)swap tips and push out air.
9) Rewipe the vial top and return to storage.
10) Inject and then rewipe the injection site
11) hold alcohol wipe with pressure till I have thrown away wrappers and put points in my sharps container.
5 minutes and I'm done.