I definitely agree with psteve, there are several ways to go about it. LST is my personal favorite since you can start training very early. I also veg my plants out a bit longer than most probably would (sometimes 2-3 months longer), and this allows me to make a dense canopy of buds out of just a few females. I usually have less than five females. Working on a ScrOG setup to accommodate this, and as soon as I find the right strain for this kind of setup, I hope to start getting at least 1g for every watt of HID light that's being used.

But that may just be wishful thinking for a soil grower...