The WD adjustment needs to be done with the leveling suspension deactivated. Not sure how yours works. It could be as simple as doing it while the ignition is off, or you may have switch or a fuse that can be pulled. Once it is set up, the leveling system can be left on to do its thing.
You are correct that you need two sway controls.
I will go against what many will tell you here and recommend that you stay with the friction controls for now.
Although the other designs do have some advantages, the friction controls will be cheaper for you at this point, and are much easier for a newbie to understand and get some benefit from. Many if not most of us, including myself started out with them. I would not hesitate to use them again, if I ever needed to.