1) align projector. Up/down lens shift is ok and makes no difference. Left/right is critical - you want the projector lens exactly in the horizontal center of the screen w/o any left/right lens shift.
2) align lens. You want the image centered top/bottom/left/right on both the entrance (back) side and the exit (front side). Take a look at how the lens is tilted. Example - If the projector was mounted w/o vertical lens shift or projector offset (vertical center of screen), then the faces of the lens should be straight up and down - no tilt. The more the projector is mounted off center vertically, the more the lens needs to be tilted.
A tape measure is helpful in getting the projector mounted by measuring the distances from the lens to the left/right sides of the screen, they should be exactly the same. A tape measure is useful for measuring the image distortion after the lens is in place. You would measure the actual projected image on the screen to see how symmetrical the distortion is.
There are three planes of possible lens adjustment - roll / pitch / yaw.
Roll should be zero. Pitch depends on how far off vertical center the projector lens is. Yaw should be zero. You want the UH380 as close as possible to the projector lens - 1/8" is about as close as is reasonable - the farther away the UH380 is from the projector, the more distortion you will have.
It can be frustrating and take quite some time to get it adjusted if you have never done it before, just hang in there and you will get it. You will likely find that it is counterintuitive about what way to move the lens to get the desired effect at first.