While I can't recommend anyone in your area, I can provide help with pricing. Since you chose a color that will very likely be marred, you have to add extra for correction. As you were told already, you MUST talk to your salesman and the service manager to not touch the exterior in any shape or form, no matter what or you will refuse delivery. Unfortunately, the transport guy WILL make sure that the paint is Fed up. The last solid black Mustang I corrected (new) took 35 hours. So just be aware.
PRICING: IF you go the PRO route, products like Opti Coat Pro starts at $800. Pro Plus starts at $1200 - not including correction, if it is needed. You can do your own, with consumer products like Gloss Coat or some of the ones AG sells. I once had a customer who couldn't afford correction and Opti Coat, so I suggested DP's coating - not sure about durability, but boy, was it glossy. So if you had a mint finish, you could do it yourself. But personally, every brand new car I do gets a 2 step polishing, no matter what. Because what is underneath the the protection is more important than what finish a wax/coating leaves behind. So one should polish the paint prior to applying any protection. One big issue you will see when consumers do their own coatings is durability. If the paint is not properly cleaned from any type of oils, the coating will not last as claimed. Of course it is easier to blame the product than taking responsibility for your own lack. Anyway, if you do it yourself, prepping that finicky black paint will give you a lot of trouble, because every time you will wipe the paint, you may mar the paint in the process. I don't mean to bum you out, but these are things you may run into. If you are wondering why those "high" prices for Opti Coat? OC provides permanent protection. So if you keep the car for awhile, the price is actually a bargain. I hope this helps you somewhat. A pro can also apply a consumer product at a savings, but you will end up spending more $$ in the long run because of reapplications over the years. Actually, here is someone in Pittsburgh who is also certified by Optimum.
https://www.facebook.com/Opus1AutoDetailing/