Advice for a Novice Replacing Laptop Hard Drive?

frugalRepairs asks: "The hard disk in my Sharp PC-MV12W laptop recently died. It gave me warning and I had everything backed up. It was out of warranty and the repair folks want an arm and a leg to fix it. I would like to replace the hard drive myself but I've never done anything like this before. It seems to me that I would just extract the old hard drive, note the physical measurements, purchase new hard drive, and install it. However, I'm expecting Mr. Murphy to visit me as soon as I open the case and would like some advice from Slashdot experts. Do I need special tools? Does the BIOS have special needs? Are all 2.5" laptop drives created equal?"