WE have worked the past two years repairing Dell laptops for our students. We have done computer repair for the past 7 years. We got the repair manuals off eBay for Dell, HP, IBM, Sony etc. The repair services were charging too much for their work, and since we were ordering Inspiron 600m's for our students; it made good sense to repair the notebooks ourselves.
The laptop replacement of lcd's is ok for some, but very involved for others. There are some outlets that have good prices for lcds. You must consider the time involved because it could be more than affordable. With the prices dropping, (unless you're retired like me) buying a new replacement would be best.
If your time isn't a factor and you love to tinker, like me; then go for it. Always give a quote first, before one does any repairs; has been my credo. The best thing we have done for our students, is to make clones of their HDDs. 30GB-40GB laptop HDD are so cheap nowadays. It sure saves a lot of anquish and pain.
We use Norton Ghost a lot in our cloning efforts and our clients are very satisfied. You can get the HDDs and offer that service for all your clients. Less work, better profits and doing a common good.