It's not that hard to replace the steering rack but, I'd first make sure that that was your problem.
Some tips I've used:
Disconnect the tie rods, rag joint, and remove the rack mounting bolts before removing the power steering fluid lines. This way you can move the rack around quite a bit for easier access to the fluid line fittings.
Also, don't let the steering wheel turn much when you remove the rag joint. Tape it up or lock it with the key (if you have a gen 1). If you let the wheel turn too much you run the risk of breaking the clockspring in the column.