personally I get more soar later... so it would be worse, personally, to wait. On the other hand, it could work for you, try it once and see! Some people say a heating pad on the spot after the shot, to help circulation move stuff around, really helps, too! But ONLY after, before will make it more painful!
There is a great video on Youtube about doing a shot, TOTALLY IGNORE THE MUSIC, I'd actually turn the sound off, but the video is very helpful! (She does forget to check for blood but other than that it's great.)