yes you can
YEs but it is very hard. There are numerous places to get parts. THe problem top inside is a peaice so when you replace it, you generally replace for the new track pad and keyboard as well. I personally recomend to do just the outside, and saving yourself trouble go to apple store or online apple store and check out hard incase covers. they are like second layer of plastic that goes right over the outside of the macbook. A few of my mates have it and they absolutly love it!