I'm a little different from Yankee. I try to put some applicable value on every situation that I encounter, whether it's lie, or spin, or wind, or whatever.
I've worked to establish these values. I tell myself, YOU HAVE TO TRUST THEM. If I can't trust them, then I did a poor job of arriving at them.
I get into the situations. I say I have to trust my figures, even though they don't seem right. Maybe 90% of the time, i do. Ten percent of the time, I can't help myself. I shade my shot tor gut instinct, and screw the figures I have.
I don't actually know which approach is right. I make some great shots and I make some absolutely pitiful misses. I shoot pretty good, but not great.
If I ever figure it all out, I'm gonna whup everyone's azz.