[support] Upgrade How-To

I have one Drupal site hosted at SiteGround.org. I only have 1 node posted and I have done very little with this site so far. When I ran their Fantastico create script, it installed Drupal 5.1. I'm not quite ready to go to Drupal 6 yet since not all the modules I want to use have been re-written yet. So, I want to update from Drupal 5.1 to 5.7 and I know that might involved some database changes.

So, how do I update? I am sure there is a Wiki, or instructions on how to do this. If you can just point me in the right direction, I will attempt an update on my own. But ... is there anything I should watch out for?

Thanks! Tom