I just looked at the scorecards of 2 players who qualified for the final round of q school: Larry Mize and Skip Kendall. They had between 3 to 8 birdies per round + an occ eagle. However they also had 2-3 bogies per round. My point is, to shoot under par and into the 60's, you will need 5-8 birdies per round to cancel out the bogies, never mind an occaisional double or triple. That is how good these guys are. Yes, part of it is psychological, but you have to play so well on a regular basis to get down to these low numbers.