Setting up a track with a laser is the best way. Super fast and easy.
I use a pod style laser setting on the track at the bottom and send the beam
up the center of the track. Just get the bottom section straight with the laser and
then start moving from there.
Any laser would work, there are some of the self leveling Bosh lasers on ebay for
around 70 dollars that would work fine.
Really no need for a pole you can actually set the laser on the track to line it up, just may
need to hold a piece of paper to see where the beam is hitting as the beam will be projected
just a bit above the track untill it gets to the hill.