Manual Steering Box

I have a manual box I'm going to install on my car. I was thinking about installing new bearings and seals myself. What kind of specialty tools do you need? I know a service manual is mandatory but beyond that, what else?
Anyone have any tips on doing one?
I opened it up and it had the rusty brown grease in it and when I removed the pitman arm shaft all the needle bearings fell out.:banghead:
I'm really not to sure if I should do it myself, I might be in over my head.