I don't think the goal is to necessarily see a lot of pitches to draw walks.
At the beginning of a game, you want your first two hitters to take a few pitches so the team can see what the pitcher is throwing, after that it's more about just being disciplined, if you don't chase bad pitches you get yourself into better counts, which is a huge advantage for a hitter.
Hitters should know what they can handle, if you can't hit low and away sliders, then don't try and hope they're called a ball, rather than swing and miss or make weak contact. Worst that can happen is a called strike, which isn't much worse than the probable outcome of swinging. Same with high FBs, if your history says you can't handle 'em, lay off them. With less than two strikes, force the pitcher to make a good pitch, don't make his life easier.
If you follow this approach, you'll get ahead in the count, get more pitches in your sweet spot, and a byproduct will be you walk more.