Hi, I have a 2011 MacBook pro 15" and I'm going to install a Samsung 840 series SSD in it. I've seen numerous videos and it seams simple. But.. Can I buy just the drive ($30 cheaper) or do I need the "upgrade kit"? I was to make a bootable USB of ML and put the SSD fresh from the package into the Mac. Boot from the USB and then use the Disk Utility setup to format the drive and then install ML like I saw in the video. Will the drive fit? Will I need a "bracket" or "kit"? I thought the SSD would just fit where the HDD is now if I transfer the screws.