How easy/difficult is it to remove the RS4 front bumper fascia and more importantly.....
 

put it back with getting everything to line up properly. Anyone done this "at home"?

It's a 2 on the Duff Beer Scale...
 

...removed to install the Lidatek a while back. No issues lining it back up...as long as you stick to the 2 Duff policy your fine.

As in I should drink 2 beers? Or no more than 2 beers?

I had mine off, alignment was no problem. There's some hard-to-reach hardware...
 

that is accessed from behind the inner fenders which are a bit tricky to reach.

I think he's just saying it will only take long enough for you to have 2 (working) beers.
 

my guess is that equates to approximately 84 minutes.

Black optics grille arrived?

Not yet. Just planning ahead.

Is there a guide somewhere? The one for the A4 looks like a lot more than 2 duffs

this might be helpful...
 

...I haven't done it yet personally, but <a href="https://www.audiworld.com/tech/ext67.shtml">here</a> is something that seems useful.

Many thanks. Seems very helpful.