I put mine on mid week. I've got it on the top set of mounting holes. I messed around with the screen height and have settled on the screen being just slightly more than half way way up. This seemed to suit me (5'10) and gave me the best compromise of protection amd visibility. I found if I had it all the way up the top of the screen tended to be in my line of vision.
I'll probably try dropping it all the way down in the summer, if we get one in Scotland!
As for fitting, dead easy job. Just the usual really, get the spacer/rubbers etc all lined up and get all 4 fixings started before you tighten them up.
I've got the cheapo look-a-likey tuono mirrors from China/Hong Kong. I had them fitted before the screen and they do make a difference, maybe 20% of the improvement. The screenhas really helped the buffeting and I rode without earplugs and it was fine. I'd probably still wear them on long/high speed runs, but for my commute through town in traffic I won't bother. With the standard screen (with the washer trick) it was unbearable above 35mph.