You pay a shop about $2500 parts and labor to remove your diffs, replace the gears, and reinstall them. Absolutely not something you should attempt on your own.
I don't necessarily think that's sound advice.
While I agree, that if he has to ask the question and is clueless about where to start then the job is likely going to be over his head.. However, anyone can learn to do a job with either help from others or research. In fact, I typically suggest people to do their own work on their vehicles. It's not only a learning experience but there's a sense of achievement when doing things yourself (or with a friend).
Do I think regearing differentials is entry self mechanic job? Definitely not. But, I wouldn't be so quick to omit it and say that it is not something someone should attempt.
[MENTION=203352]Gavinstuckey[/MENTION]
The job is a very tedious one. If you have little to no skills in it then it might be something you source help on or request a business to do it for you. It requires meticulous settings and specific tools to do the job and if not done right, can result in catastrophic failure.
My suggestion is to ask someone you know that is more mechanically inclined if they can help you with the job. If not, then you can source out some prices for a shop to do the job. Another option, listed above, is to go to
East Coast Gear Supply and shop for pre-assembled differentials that are a plug-n-play job once you get them (but still require some mechanical experience).