Broken Superdrive out new HD in
There is a hamster inside every apple superdrive that makes it work. After about 2 years or so he dies and the superdrive is made worthless. Replacing it costs upwards of $100 with a used drive, more with a new one. I've been using an external drive for a while and did not need/miss the superdrive, but was low on storage.
Supposedly it's moderately hard. However if you know how to use a screwdriver and have a #00 screwdriver then it's fairly straightforward. Look at the pictures and take your time not to damage anything.
I used a hard drive bought from somewhere else since I wanted 1TB and ifixit doesn't sell one that big.
In step 12 of the guide, along with removing the connector from the back of the superdrive, also remove the little metal bracket held in by the 2 screws. Screw this bracket onto the new enclosure for the 3rd retaining screw when reassembling.