1. Power down; remove power cord
2. Lift case open lever on back panel; remove side panel and plastic insert
3. Insert drive in bay; flip lever to hold in place
4. Attach the SATA cables that are already conveniently placed next to where they should mount on drive
5. Replace insert and side panel (and push down case open lever)
6. Replace power cord; power up
7. When mac asks you if you want to initialize the drive, say yes
8. When Disk Utility opens, select drive; click on partition tab; click on partition button

That’s it.

On a separate note, the current sweet spot for HDs is 250Gig, 16Meg ram cache, 7200rpm for $100.00. Unbelievable.