If that model HP is like the HP I had a few years back, the drive bay is modular and the whole thing can be removed as a unit. If you remove the front panel it's possible that there are a couple of screws holding it in place and the whole thing will slide out. Of course you'll need to detach the cables first.
I believe this link has the instructions you require (scroll down to the middle of the page):
Replace Hard drive
There's even a video to show you how.