Toyota Repair: !988 Toyota 4x4 Repair..., drive belts, oxygen sensor

Question
I am a do-it-yourselfer.. Is the oxygen sensor, exhaust manifold/gasket and water pump (original with 200,000 miles) change a reasonable project for a basically handy gal?  Are there any specific areas of concern with these projects?  It looks like the drive belts and water pump are good to do together, as well as, the oxygen sensor and exhaust manifold together. The truck is also EFI. Thanks for your help.

Answer
Replacing the water pump and belts is fairly straightforward, these engines are not that hard to work on and are very simple in design, the only thing you need to be concerned about is that these had a problem with exhaust studs pulling out of the cylinder heads so some of them may have to be rethreaded or have heli-coil inserts installed, just something to watch out for.