My approach with various bikes has served me well:
1) Find a flat piece of street without any traffic at night.
2) Stop at the side of the road and, using the tools that you remembered to bring with you, adjust the beam so that it illuminates the the longest distance of the roadway that still gives you visual details.
3) Sit on the bike to check No. 2. Re-adjust as necessary.
4) Drive the bike in traffic at night.
5) If drivers flash you, adjust down a little bit and try again. Repeat as necessary.
6) If no driver flashes you, smile: you are done.