I went to our local dealer and the shop foreman took the time to show me the best method. The steering wheel comes shipped in the crate with the machine and the dealer usually looks at the front tire on the drivers side and gets it straight and puts the wheel on, so don't use the steering wheel as a guide.
I counted the threads shown on the tie rod, at the nut, and adjusted them equally until it looked close upon inspection, standing back and looking at the front.
I now took 2 pieces of string and 2 jack stands and tied the string on the rear hitch and brought the string around the back tires and up past the front tires and tied it to the jack stands. Move the jack stands in and out until the strings just starts to touch the front of the rear tire, now you can measure off of the wheel on each side to get your toe in. The string needs to be in the center of the wheel to be accurate.
Now remove your steering wheel with a 19mm and center it, start the machine and turn it left to right and check your center to center lock.