You could have done it by now!
pesky work getting in the way of daylight hours!
It's hard to be certain from a picture, but it does look like it's just transfer from the other car. You (and Chips Away) seem to think so too.
I've been painting cars for over 20 years but I'd certainly have a go at "polishing" it out first. Anything slightly abrasive should do it, from a decent all in one polish to T cut, polishing compound, even a decent toothpaste! I'd stick with something designed for the job though, just to be safe. A bottle of something and a few cloths will be much cheaper than that quote you've had, and elbow grease costs nothing![]()
Totally, having never really used T Cut I really wanted to hear you can't screw it up, to be honest it had never occurred to me to try removing some of the paint with a credit card or similar either, makes perfect sense.
Looking forward to the weekend now lol