i always looked at a spoked wheel to see the cross pattern (my berg wheels are cross 2) and lay out the wheel without the rim, arranging the spokes as they will end up, taping the crosspoints together, then applying the rim, and then the nipples. using as thick a wrench as you can find, start on one side and tighten about 3 spokes enough that the spoke is well seated in the nipple, then go opposite and do the same, then 90 degrees, etc until its pretty much equally snug all around. eyeball the offset (the rim sits 45mm from the edge of the brake side and 55mm from the sprocket side). assuming you won't have a trueing stand, take the axle and put it in a vice standing up and put the wheel over the top so the wheel sits horizontal. fashion a runout indicator ( i use a thick piece of solidcore solder) and fasten it so that it can be placed next to the rim. start tightening spokes side to side in small increments while checking runout and adjust the high side in and the low side out til you get it as close as you can. keep an eye on the offset and adjust it by loosening one side while equally tightening the other.