Insert 3-pin male Programming Header and 3-pin male Servo Header (short ends through the PCB) without soldering yet. Insert the 6-pin female receptacle (it may be too tight for all the pieces to fit flush).
Shave or sand off receptacle if need be so it fits next to Servo Header. Once all fit flush to the PCB, solder pieces in place.
BalloonSat Easy Flight computer, without chips, ready for testing