I purchased an SSD upgrade kit, and am putting in a 240GB SSD into my 2009 13" MBP. I can figure out the HW end of things, but what's the best approach to migrating the OS and my apps to the SSD? Should I back up and restore from Time Machine? Should I build it from scratch (though I no longer have system disks, given it's all via the AppStore now). How do I remove the OS and the apps off my larger HDD? I don't need step-by-step. I'm asking more about the best strategy/approach. I've read about enabling "TRIM" on my SSD but I'm not sure I understand that. The references I found for that were a bit old. Is that still needed? edit: also, my HDD has about 550GB used. The SSD is only 240GB, and I've also read not to fill up an SSD past 50%(??). So a straight up clone won't work. I should have noted that earlier. Any other tricks/tips/traps to be aware of?