As far as sitting vs standing goes, it depends on the hill. There's a short 14% job near here that I do quite often. I get out of the saddle and attack that one because it's short. On the longer climbs (one that is 15km long) I tend to stay in the saddle and concentrate on maintaining a reasonable cadence. This is something that comes with practice.
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I am clinically insane. I am proud of it.
That is all.