Has anyone replaced a MacBook Air battery by themselves before? If so, did you get into any technical problem while you were working on it? I have a mid-2011 13" MBA base model, but I am only getting about an hour of usage, so I need to replace my battery soon. My MBA does not have warranty, and I saw that Apple charges $130 to replace the battery. I also saw that iFixit sells the battery kit for around $110, and they also provide some video tutorial, so I am debating if I should do it myself or bring it to Apple Store. I am not comfortable taking things apart, but i have previously fixed my iPhone 4's home button (it works, but it took me 2 hours to replace the cable as I messed up some steps). Any advice is appreciated.