First time on NCL in many many years. Mostly sail Princess and Celebrity. We didn't book until later for our April cruise so all speciality restaurants were booked. According to NCL they book 20% in advance (I've seen different numbers on this thread). My question is; is there a central reservation desk to make dining reservations or do you, should you, go to each of the speciality restaurants individually. If centralized, does anyone know where it is on the prima, deck and general location? TIA