when i buy pins i buy the needles with 25g 1.5 inch and i buy an equal amount of 20-21 guage just the needles for drawing the oil with
best to only stick yourself with fresh pins, they get really dull after ou stick them in the vials and last thing you want is scaring
also, one of those heat packs that you microwave on the spot you just injected virtually eliminated soreness for me afterwards