We've always done it from the top going down. That way the final plug is under the tree not way up at the top. Then, you just have to run the extension cord or whatever under the tree skirt and you don't see it. Plus, if you have "extra" lights when you are done, you can find room for them at the bottom. It would be hard to do that if you ended at the top.
Amy, wife to Greg and proud mommy to Cailin Avery
(5/6/07), Kylie Elise
(12/20/08), and baby #3 (due 10/11/11).