Building, tensioning, truing wheels is easy. Just remember that every time you adjust tension on any given spoke the rim will move laterally AND vertically, so in practice it moves diagonally. If you're adjusting radial runout you have to adjust every spoke in the problem area tighter or looser to keep the rim straight. If you're adjusting lateral runout you will usually end up adjusting the spokes on one side tighter and the other side looser. Just visualize in your head diagonal as well as lateral/vertical movement.