The #1 question I get asked on this blog is "What's your #1 piece of advice for a novice DIYer?" I sort of hate that question because every situation is unique.
Is it "prime before you paint?" Or "measure twice, cut once?" Or "dull blades are dangerous?" Or "make certain the breaker is really off?" Fact is, you'll find lots of sites with lots of Top Ten lists for do-it-yourselfers. Just read the first thing on the list, I guess.