Not often that I disagree with Arthur (actually don't recall ever disagreeing with him before now), but I'd have to recommend straightening while unstrung, especially if you aren't familiar with it. You can "flip" the bow if you aren't very careful (been there, done that). If that happens, you can get hurt and may ruin the bow. What I mean here is if you go a hair too far the string can jump out one side of the groove and twist the limb around in a big way. Bad, bad, bad news when that happens. Otherwise, I agree with 99% of what he said. Dunno about the sun thing--never tried it.

Chad