thanks very much for this thread emellaich, it has the potential to be a really valuable ressource for all the independent writers around here (and there are more every day !).
so, now it's time for everybody to add their tips, knowledge, info, good addresses and best practices ! a good idea to start might be to follow the subjects from emellaich's list and add whatever info you have about the point(s) in your post.
this would also be an excellent page for the wiki, under "how to self-publish" or "tips for independent writers" or something.
i've stuck this thread so it will be easy to find.