i recently bought a mid-2012 13 inch mbp. i already upgraded the ram to 8 gigs and the next thing i want to do is replace my hdd with a ssd drive ,i seen many videos on how to physically swap out the drives .my question is how do i install the new os onto the ssd ?ive also be told that i dont need to install the os cause with the newer model macs will automatically download the os once i try to boot up.