Congratulations. This is one fine arm. I have a DP6, but I'm sure much of the same applies to the UP4.
(1) filling the cuing lever with silicone - be careful not to get any on the sides when you are filling it. Try to inject exactly what you need, or perhaps just a wee bit less per the instructions, then jerk the syringe away quickly so it makes a clean break. It will take a day or so to settle before you will know if you have enough or not. You can add a bit more then if you need to, but getting the excess out is a pain.
(2) silicon damping - try the arm without it first. You probably don't need any at all and getting it out later on is a pain. I used mine for years without it and tried it on a whim later on. The difference was subtle, but I can't really go back now to see if it was better or worse.
(3) obviously clean the contacts on the arm mount before securing it down.
(4) mount the cartridge with the arm detached, if this is easier, then you can attach it to the arm mount.
(5) burn in the cables before installing the arm. Here's what I did. I made a jig from some RCA's and some solid core chassis wire, soldering a wire to the + and - of each RCA. Plug these RCA's into your CD player and the wire ends into the cartridge mounting clips on the tonearm before it is mounted (use a sufficient guage wire so they fit snugly enough to hold). Then attach your tonearm interconnect to the tonearm and plug the other end into your preamp. Your tonearm is now your CD players connection to your preamp. Play for 100-200 hours, burning in the silver wire. This is very important, because the tiny signal of a cartridge will NEVER burn in your wires sufficiently by itself.
Enjoy,
Bob