Quote - Not being a hardware type of person, I'd probably not try dissasembling the external drive myself.  Probably could take it to a workshop that does data retrieval.  Now still rebuilding runtimes from DVD-roms, as my time permits.  

Got any friends that know how to install a hard drive?

For a test all that is required is to open the external enclosure unplug the cables to the drive then plug in the cables from the internal harness. After booting up the computer the drive will be recognized if it's accessible.

If the drive is visible you should have full access to your files. If it's not visible then it's time to spend money at a shop.