I do all my own wrenching, including wheel building. A stand makes it easier to true up a wheel once it's laced, but you can also do it on the bike using the brake pads for the left/right truing and a popsicle stick and tape for the roundness. Not very elegant, but it works. Just a few months ago I needed to replace the rear wheel on my commuter bike as both the hub and rim were trashed. I bought a pair of used wheels for $10 from a bike shop where one had a good freehub and the other had a good rim. One hour later I had a rear wheel that will give me years of good service.