DJ you can use either a star in the west or east (+/- 5° is good)to about 15° above the horizon. That will give you a fair number of stars to go by. You can go more than these but it will take more iterations between Az and Elev to get it right.
The same thing applies to adjusting your azimuth. You can have a fair bit of leeway, but the greater the distance from 0° dec and meridian the more iterations between elevation and azimuth adjustment. If you can keep it within that 5° range you will be sweet.
