Any garage will do it....
The wires will be spliced and will be very easy to remove.
Depending on the fitment you may need to refit an original rear support bar though. My last 3 BMWs, that Ive fitted a tow bar to, require you to remove the standard rear support and replace it with one fitted with the tow ball bracket. If I remove the tow bar now, Id have to get the standard part to replace it.
On some cars the tow bar can just be an addition, so removal is easy, on others you need to replace parts to get back to standard.
What If There Were No Hypothetical Questions?