uh,,,, I agree with the no Mommy and daddy angle and those points. However,,,,,,,I also feel you need to have someone there who is mentally and physically able to do combat with these people.
Most dealers and shop people take classes in psychology and sales strategys, as well as conflict mgmt and dealing with personalitys.
At least, the smart ones do,....Its part of the business model to walk up to a customer and gain their trust and talk them into a sale even when you say no no no..... Same thing with conflict. With the right training you are 3 steps in front of the other person, you can size up their strengths and weaknesses and employ them, If you dont have those skill sets, and some one is looking to come out ahead of you,,,, they have the advantage.
Cops do this too,. at least good ones do.
I used to have an ex girlfriend,, Her Dad was a master at this type of psychology,,, He was retired, and for fun, bought and sold vehicles at least 1 a month, would trade one in, and buy another, ALWAYS ALWAYS came out ahead,. He did it for fun, didnt care about the money. He loved the negotiating, would take all day to close a deal. he loved it. The poor sales people and managers, plus the "Closers" poor bastards,,, I almost felt sorry for them, It was slow torture. the guy was so far ahead of them it wasnt funny and he would lead them on, let them think they were getting somewhere,, then "WHAP" back to square one... I sat thru 2 of those sessions, I was in awe, but annoyed as well, (huge amount of time) But even after we broke up,, I recomended him to others, it would only cost you dinner or lunch, IF YOU WANTED A VEHICLE at a dealership, you wanted him with you. He could crush your spirit and self esteem in a second if he wanted, Or string them along all day.
So, more directly,,, this fellow isnt ready to swim with the sharks, he needs a skilled wingman in there. whether its his Dad or someone else,,,, dont walk in there on your own.