Most times when I do GET a shot, I've been sitting a long time...elevated or ground...and it comes without warning!
So when I do a "cold shot" I sit in whatever stand I'm using to "practice" and psyche myself... try to get the heart rate up, talk smack to myself, then bear down and try to really, really concentrate as this is the only shot I'll get all season!
IF I have "laid off" a while on shooting, I usually do fairly well. If I've been shooting a lot, it seems less beneficial. I've talked to several other trad shooters and we seem to share that malaise.
I THINK... that the problem is that if I am only shooting ONE SHOT, I can truly BEAR DOWN and concentrate and let the natural rhythm flow.
When it goes well and then I try to replicate it with #'s 2, 3, 4, 5, or 6, I start THINKING and that screws the pooch! Everything goes to pot. Like Rod J says, I let the one guy behind and guy in front get into debates on who's in charge and screw it up.
That, and I get tired. Also, I get bored. Shooting alone and fully, totally, concentrating ONLY on the shot, is WORK! When I was younger, I could shoot all afternoon and not loose concentration or tire...no more.
I practice to hunt, so that first one, after sitting and being all stiff from Uncle Arty etc, is the only one that counts!