Half Life said:
I think the HDD is under the CD drive.This
picture should help you.
Edit: I suspect you will need a phillips screw driver, but the task itself should be simple. Unscrew, lift, replace and screw it back.
That looks very helpful. After breakfast with the family I'll check that out and if it swings out I'll mark as solved.
It looks like it just swings out, so not sure which screw you are talking about unless you mean HDD chassis screws... It looks like, pull and swing up, disconnect cables, unscrew drives, and swap.
I'll update soon.