Hey all, I'm looking to get a j12 for x-mas from my bf, but I was curious if it's difficult to change the battery on the 33mm? or do you always have to take it into chanel? And how does the 38mm work? do you wind it like other automatic watches? Also any tips on how to score a great deal on one, would be greatly appreciated. I'm looking for white diamond markers. Thanks for everyone's input ahead of time!