Life circumstances left my RV6A a hanger queen for a long time and I have spent quite a bit of time getting it back up to snuff. I just did the nose gear SB this summer so its fresh in my memory.
We did not change the wheel pants, my old one (1992 model) fit back on perfectly, so unless you really want another one, why bother?
Pull the old gear out, spray on some lubricant if you need to. Obviously you will have a stand ready to hold up the plane while you have the gear off.
Take the new and old gear leg to the local machine shop and have them match drill the hole for you. Its not necessary to ship it back to Vans unless you want.
Assemble the new fork and wheel, on the bench. While its off go ahead and put all new hardware on everywhere. It is also a good time to put on a new nose wheel. I put on a Grove wheel, with a Desser tubeless tire, and am very happy with it. No more shimmy.
After bolting it back on the motor mount, grease the fork and work the grease in before setting the the breakout force. We farm, so a grease gun is a daily used tool, we use Chevron Rycotac grease, but i cant imagine that the exact brand would matter.To set the breakout force, we used a fish scale. Have someone hold the nose off the ground, attach the scale at the axle and pull 22-24 pounds each side of the wheel and secure that with the castle nut and cotter pin.
I also put on the Anti-Splat nose brace and fairing. That part hasnt been "tested" thankfully, but I am very happy with that as well.
this link has some good info, and also pics of the WD631 stop flange.
http://www.vansairforce.com/communit...nose+gear+fork