hmmmm, I've never built a motorcycle wheelset, but I've done a fair share of Mtn Bikes.... I can tell you that it is much easier with the proper equipment, but the principal is very simple... you can do it without a truing stand, but it is more difficult... you probably can't do it right without spoke wrenches... and a good tensionometer is a good idea for someone new (you want the spokes to be under the same tension throughout)... but you can get by without it if you have a good sense of feel..
good luck..... I'm sure you can do it, if YOU think you can (use your swingarm as a truing stand... tape a guide to it on both sides, at right angles to the swingarm.... such as a pencil or screwdriver, to indicate center.... spin the wheel and move the guide in closer as the rim gets better and better untill it is centered and not oblonged... then set the tension.. while keeping an eye on the guides )