First time I installed anything on a computer. I am terrible when it comes to any kind of mechanical work so it gave me great satisfaction to have completed this task successfully. This work was done on my Dell Precision T3500. Tools I needed:

• Philips screw driver
• Computer case screws
• SATA cable

1. The drive gets installed in the 3.5″ Flex Bay (where a floppy disk drive would get installed if the computer had one). Read the post by joseflv on this link: http://en.community.dell.com/support-forums/disk-drives/f/3534/p/19312413/19632757.aspx. This link is also helpful as it tells you what kind of screws you will need etc. http://knowledge.seagate.com/articles/en_US/FAQ/196169en
2. There was a steel cage inside the bay. It was screwed and there was no way to remove it. Because of the steel cage, the drive didn’t go all the way in the bay.
3. Next step is screwing it. You have to get the exact screws and this is why I dread mechanical work. Anyway correct screw size is 6-32 and I got them from Home Depot. They were labelled as Switch Plate Screws #6-32×1/2″ (1/2″ is length if screw). Home Depot has screws of varying length. The minimum length they had is 1/2″ and thanks to God, they worked when I tried them. I could not find the screws at BestBuy and Walmart btw so don’t waste time going there.
4. When I booted the machine, the hard drive did not show up in disk management utility.
5. I had to goto BIOS (F12 -> setup utility), and check on a box which would tell the machine to scan the SATA-3 port where I installed the drive. SATA-0,1,2 are taken up by HDD1, HDD2, optical drive (CD/DVD)
6. After that Windows7 automatically installed device drivers when I started the machine. Just had to goto disk management. It showed me 1TB unallocated space. Right click -> create simple volume -> walk through the defaults. Accept MBR in place of GPT (this is also the default option Windows7 gives you)
7. Done!

Also, this post helped me understand why my 1TB drive was showing up as only 931GB in windows.