Usually pretty simple. Bumper off, generally replace the bumper reinforcement with the towbar, re-fit, wire up. Sometimes you need to trim the bumper to clear the bar or the attachment for the swan-neck.
You'll need a relay box for the trailer wiring otherwise it upsets the bulb failure detection - that'll be £30 ish.
2-3 hours work on an A4 or A6. An A8 is probably a bit more complicated, just because!
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