thx123,
I a big believer in "I've done this before; therefore, I know what to expect" more than acclimatization. I can go the High Sierra after being away for a long time and not have any problems, not because I'm acclimatized because I'm not but because I've done this a bunch.
I know enough to slow down and not to push, especially on day one and when I go above 12,000'. For me, experience plays a bigger part in a successful Sierra experience than acclimatization...YMMV.
