Initially I though I was just upgrading to a larger, faster drive in my laptop... come to find out the old drive was failing and I didn't know it.
The firewire 400 SATA laptop hard drive enclosure from iFixIt worked great with simple instructions on how to load and use the enclosure. The drive upgrade had a set back early on when the drive would not clone due to an unreadable/unwritable file on the old drive. The software I used, which was suggested by iFixIt (www.shirt-pocket.com) showed me the file causing the issue so I deleted it. The software also requested that I support the issue for review so I did that too. That morning I had a response back from the software publisher with the answer. (Amazing)!. Once the drive was cloned I used the iFixIt instruction set for drive replacement (specific to my MacBook Pro version) which was by far "The Best" tech instructions I have encountered. The upgrade was by far a success story!
Make sure to get the correct instruction set for your specific machine before you start. iFixit has a great instruction resource! I had two machines so I was able to go back to the website for more info. Use a bin for your hardware (screws, etc..). I took a clear bin and made a grid using tape to seperate each step into areas for each step's hardware. I was able to put the machine back together in reverse order in a snap! Wouldn't have been able to do it without iFixit's great instructions & videos! I was so excited to fix the machine I forgot to take pics... next time!!!