May I humbly suggest a haiku on the topic of your new light fixtures? You may, of course, wait until they arrive and have been installed.

My tip, which you may already know, is this. Bend an old wire coat-hanger and use it to suspend the fixture from the crossbar inside the electrical box while you tie up the wiring. (Also, wrap electrical tape or similar around the part of the hanger where the fixture will be resting, so it doesn't scratch the finish.) Let me know if you need any other help or ideas, since I just hung a couple of these things myself.