A) FORD dealer. Mistake #1, unless they offer the BG service.
B) Try a LINCOLN dealer, they are more familiar with the Ecoboost vehicles, and may offer to do it.
C) Go to
bgprod.com website and look up service centers that do driveline service.
D) Really isn't that difficult to DIY as long as you have jackstands and/or a lift handy. You should ask the 13+ owners (esp those with the PP package) how much more of a pain it is.
Bottom Line: DIY. Second best: find a BG center near you to do it.