injection

Was a big advocate for the typical 18 Gauge to draw, then switch to a 25 gauge 1 inch to inject usually into the glutes. I however read that this can lead to alot of scar tissue build up. I have now switched to daily injections and want some ideas on how you guys pin yourselves. Currently...

How many pins until a 'virgin muscle' usually isnt so stiff and sore from pinning in it? Do you think it is the needle making a hole itself or the oil itself inside that causes the muscle to become sore? I used to pin in my quads 8 years ago and havent since. Just tried again a few days ago and...