Thank you very much for your answer. I appreciate it.
1. I need to be able to see my own htaccess file; I will want to modify it manually and upload a new one many times in the coming years. I can't believe GoDaddy hides it. For me this is a deal breaker. Their "easy" installer should come with a warning label (or perhaps WordPress should try to warn people). I do want to use permalinks; I'm thinking "%postname%.html". Are there known issues with GoDaddy and mod_rewrite (perhaps if combined with forwarding "domain.com" to "www.domain.com")?
2. I'm thinking I might prefer to install WordPress in my root directory. Some people claim this is better for SEO.
3. I want to upgrade to 2.6 (from 2.51).
4. I've decided not to modify Kubrick. I thought doing so would be easy and I could get some help if I got stuck, but I couldn't get my question about it answered after two attempts, so I'll find a theme that's closer to the look I want and modify that one.
For these reasons, and because I haven't done anything other than a test post (which I don't mind losing), I'm planning to reinstall WordPress. Here's my main question right now: Do I have to do anything to the data base (if so, how?) or can I just install as I would if I were starting from scratch?