RE: Idler wheel lean
Most can do just fine with a small level if they have a vice to hold the bow Check the bottom cam for level,then adjust the idler/top to match
MOST bows will be fairly close in the static position and you could even call the factory to see what they reccomend the lean to be in the static position.
A laser and some way to hold the bow at full draw is definaetly the best.