actually, there's one more step, you got take off the cap on top of the steerer tube also to pull the stem off. Then pull the stem up and flip it. When you go to reassemble, replace the cap on top of the steerer, and tighten that bolt down first. You are pretensioning the headset bearings. You want it snug so that there is no play in the headset, but not so tight the bearings bind. (to test you have no play, put thefront brake on and the roll the bike forward, if the fork doesn't move, its tight enough). Next you tighten the stem bolts and face plate.