Why not just dray it all up in one? And I like to change needls between vials, my needle only touches one vial top, ,then is changed (except if its a slin pin, then you have no choice) Keeps everything clean and easy. This is what I do wiuth my 4adcyp and 1 test cyp.
A better plan would be
Draw, change needle, draw from other vial. Change needle, shoot one delt, change needle and then shoot other delt. Draw everything you need at one time.