if using the right sized spokes this should be very simple providing you are using the right spokes, go round in the pattern and method you use making sure that the rim is the right way round (disc rims), once you have the drive side if rear or disc side spoked go round and turn all the nipples until they sit just covering the end of the thread on the spoke, then use the same method the other side. at the end you should have a decent build that is dished but not tight, then insert wheel onto your bike and true it up until straight, this is one of my methods of wheel building with out any dishing tool or gig, also i think this is a good method as you get your wheel centered to your frame or fork perfect, thats if your a perfectionist like me,