I am sorry to be very busy these days Will do as soon as I finish my projects Probably next weekend

OK, the socket is right. 'cause M500 got many versions, I didn't know which you are referring to. But just a precaution, do you mind to have irrecoverable folds on your sticker covering the speakers? If you don't, I will show you how to

Like what I said, M500 does NOT fit this laptop!!!! Please do read up about M.2 socket

It is not a hard job to disassemble this laptop. However you should note the it will cause unrecoverable damage to the sticker covering those screws. Your laptop will look ugly even if you manage to stick back. Plus, I have not see large SSD brands release M.2 SSD yet (Intel has one, but 180G only). If you have the SSD you want to replace, and you are sure you do not care about pealing off the sticker, I can teach you how to do that