I started getting carpal tunnel like symptoms probably 10 years ago. I read a lot of information on the internet and books, and attended an RSI support group. Eventually I found that my case wasn't the career-ending tragedy that some people make it out to be. My symptoms come and go, increase and decrease. I went to a couple doctors and didn't get any great help-- one gave me wrist braces, one gave me NSAIDs. I've tried different things. Here's what definitely helped:
- lowering my typing table nearly to lap height
- getting a good ergonomic keyboard (a Kinesis)
- adding thyroid medication (seems to reduce overall inflammation)

Here are things that helped some
- wrist supports, worn either overnight or while working
- NSAIDs, but eventually they gave me stomach irritation
- Stretching and self-massage

Here are things that definitely make it worse
- using a laptop keyboard instead of my Kinesis
- job resentment
- having the keyboard too high (like typical desk level)

I guess my message is don't assume it's going to cripple you. It may be manageable.