How hard is a power steering gearbox rebuild? 73 dart

I started this thread two years ago. Here is an update. I sent the steering gear box and the power steering pump out to Steer and Gear for a rebuild. I am happy with the results. no more leaks. I chose to keep the steering feel at the factory stock settings. I think it is a little tighter than it was but that is OK. The whole front end rebuild was a success and the car handles much better.