To fix my 5yrs+ Macbook Pro would have cost more than it was probably worth. So I bought a new computer. But the old hard drive was still good. A colleague sent me instructions on making the internal hard drive an external one. And all I needed were tools.
It worked fine. My new external hard drive is working great as an extra backup for iTunes.
Have LOTS of light. Ended up using a book nite light attached to the monitor of the Macbook Pro so I could see the threads of the screws.