Just did an LCD replacement on a white old model MacBook. Followed this guide to a the letter. IT WORKS! I'm commenting on my fixed mac now. Excellent guide. Things I would suggest are to read through everything first and keep a note of screws labeling etc. you'll be grateful on the return trip. Also watch the routing of the cables when working on the lcd housing and right hand side of the lower laptop. Not only have I fixed my problem. I've realized that customizing macs and doing your own repairs is relatively straight forward if you follow instructions.
This website really empowers the apple product user. Shop around for parts, ebay is a good place to start. I got my screen for £65 (UK).
Final word take your time and if you are replacing LCD screens expect it to take up to 6 hours.
Also if you are replacing Samsung LCD screen it has a test port (on left back) which most replacements do not. Don't worry about it, it is nothing to do with a Mac.
thanks again ifixit.com!