Now that you have the up and down dialed in, you can start to work on the side to side. Your spokes should still be fairly loose so you should be able to manipulate the rim quite easily. A spoke torque wrench is a big help for these steps. As you come to a spot that is too far to the left, let’s say sprocket side, you will want to give the right (disc) side spokes a quarter turn. If you are trying to move the rim one way and the spokes are starting to get tight, begin loosening the opposite side. You are trying to tighten the spoke, yet this is still just truing the wheel. Take your time and don’t overtighten the spokes. Remember the whole wheel is a tug-of-war, so if you want to go a little in one direction, give a little in the other. Patience will go a long way if you are new to this; it’s not impossible. Don’t feel like you have to make the wheel absolutely perfect. This is for a dirt bike, and the first thing you are going to do after you put it on your bike is flat-land a jump or slam into some rocks. There goes your perfect wheel.