yeah, with Al nipples it is important to get the wheel round and straight while there is minimal tension on the wheel, then you can start bringing up the tension slowly and it should be pretty easy to keep the wheel true.
the 4sides spoke wrench is key. also, pushing the spoke off the bend of the wrench as you pull the wrench off.
i don't really think Al nipples are worth it after i went to replace a few spokes and had about ten nipples break because they were frozen on the spoke...oh well.