I'm sure that the unclipping and the 6:00 vs 12:00 position is also a personal preference. The problem as a newbie is to figure out what your body naturally wants to do. I tried unclipping near grass on my right side because I was practicing unclipping my right foot first, but I actually fell away from the grass and on to concrete. However, that did help me figure out that my body STRONGLY prefers unclipping left first. Personally, I also unclip better at the 6:00 position too.

Reminders: Don't forget that you can also backpedal your leg to get in the best unclipping position if you are slowing to a stop. Also, don't forget to tilt your bike in the correct direction so that the bike leans against you after you have unclipped. I have fallen over with 1 clipped leg and the other leg standing at the light because I accidentally leaned my bike the wrong way.

Can you all tell that I have fallen 20+ times by now?
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle
2010 Santa Cruz Juliana with R kit and Crampon pedals
2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle (sold)