You should be fine. Be sure and tell them when you check in about your FP+ time and they will accomodate you. I have seen them call people with CRT ADRs that are close ahead of other people who had earlier reservations if they are backed up. DD has done BBB a few times and we have always had an appointment between 10 and 10:30. Generally, we are out by around 11:30, including the post makeover photo session. If the time gets tight, after the makeover you can go visit A&E with your FP+ and then come back to BBB to take pictures in the photo studio.