I put one on my wife's bike a number of years ago. It is pretty simple.

I didn't grease anything where the stem contacts the shim or the shim to the steerer. I have had the aluminum "spacers' below the stem get stuck on a steel mountain bike steering tube, so I have put a bit of grease just where the spacers sit. I think that is personal preference and how much water/rain the stem is subjected to.

There is no washer between the cap bolt and the cap. It is just like any other threadless stem cap except the slot allows for the cap bolt to properly align with the slanted insert. You pre-load it the same way.

I has worked well. Since you have one, you know that you start with a 12*, 17*, or 24* stem angle and then adjust that angle in 2* increments to fit.

John