Personally, I DON'T handle it. Everytime I get close, my hand turns into a wet dish rag. Mildred comes out of the attic with all of her Don'ts: Don't rush; don't muscle it, don't yank it, don't grip it, etc. Of course, that's EXACTLY what I end up doing.
Once, I was bowling against a Pro and he did try to give me some advice. This was the first time going for my 12th strike. I got up there and actually heard someone whisper behind me, "Look, he's knees are shaking". Sure enough, I yanked it and left two. Don't get me wrong, I was VERY excited about my 298, but still understandably disappointed it wasn't a 300. The Pro came over with some sage advice.
He said: "I did the same thing at my first 12th strike - yanked it and left two. And I STILL get nervous at the 12th. But now, everytime I get there, I expect the butterflies. I know I'm going to loose the control battle and give it just a little extra. So now, I move two boards in each time I go for the 12th and I haven't missed one since; 13 in a row and still counting."
Sounds like good advice to me, but I wouldn't really know. I haven't gotten to the 12th again yet. But I'll sure try it if I ever do.