Good job. I recently had to do mine twice in a week. Way too loose for me...sounded like a playing card in bicycle spokes. The second time only took about 1.5 hours...practice makes perfect I suppose.

You wouldn't be the first to adjust a valve too tight. Get in line behind me! :D

Suggest you do some research on the "backside method" which uses an .030 and .025 feeler guage as NO GO and GO respectively. With this method you can check each valve without re-setting each one in turn.

As for not draining the oil - jack the car up and do each side of the engine respectively. Remember that you are then rotating the crank 240 degrees between sucessive cylinder adjustments, not 120 deg.