That's been the hardest for me too -- getting my lips used to the metal! My cheeks and gums are seemingly pretty well acclimated at this point.I think the most challenging thing for me so far is talking. My job requires a moderate amount of telephone conversations, and also meeting with people. I've found I need to speak slower to give my lips time to negotiate over the braces. Due to my overjet, my lips have a hard time closing, which is fine, except I found myself picking spider webs out of my braces yesterday!
My suggestion: Make sure you drink plenty of water and rinse with warm salt water 2-3 times a day, even if you THINK you might be developing raw lips or mouth sores. After doing so, be sure and rinse your lips with clear water, pat dry (thanks for that suggestion, Linda21!), and then apply your lip balm.
Biology is a fascinating field. I enjoyed it immensely during my college years! As a boy I was fascinated with the animal world, particularly insects. Ever hear of the "Junior Entomological Society"? I was a member! Probably doesn't even exist these days
Sounds like you're doing great! Continued success!
Oh well, it comes with the territory. 
So far the only pain is in my top front teeth and it's not bad for now. I decided to post an updated pic for comparison at the 3.5 month mark:
Yay! Originally he had said he wanted to wait 6 months into treatment to decide how things were going. I am relieved because I really don't think I could have easily said goodbye to 4 teeth. He also said that my alignment is moving along extremely well! 
I'm hoping that without extractions, maybe my treatment time will be shorter than the 2 yrs originally quoted to me. I will keep my fingers crossed.
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