lisar915,
It's really not that difficult to install a laptop hard drive. You basically need to locate and remove the existing hard drive (usually under a screwed-in plastic panel on the bottom of the laptop), then simply replace the new drive where the old drive was. There may be mounting screws and there is usually some type of ribbon cable between the laptop & PC.
Be sure that you have a restore DVD or CD to reinstall the original factory OS and apps that came with the PC.
Check out:
http://www.fonerbooks.com/laptop_9.htm
Hope this helps.
- John