Do it MinnFlyer's way. The only reason you insert a pin in the middle of the hinge is to make certain the same amount of hinge materiel is used on each end. If your CA hinge is slotted in the center already you're good to go. If your CA hing materiel is solid its a good idea to drill a small hole in the middle of your hinge slot (on both surfaces) to help it wick in better. This is not absolutely necessary but doesn't hurt and might help.
After you have all CA hinges in place, centered, and make sure each one is truly in both sides in their slots and you are satisfied with the fit...then sit down where you are comfortable, have good lighting, and can see clearly and flex the control surface as far as you can and still not expand the gap between the surfaces. In the case of the aileron for instance; hold it such that the wing is also tilted up so that the CA will run down into the slot. Dribble some CA onto each hinge on the wing side, the while holding everything together and still bent..tilt so that the aileron is now down and CA will run down into the hinge...and dribble some on each hinge.
Once all are done and you've held it together with the surface flexed the entire time; Flip the wing over, flex the other way, hold it, and dribble some CA on each hinge while tilting the assembly so that the CA will run down into the slot you intend.
Once all of them are CA'd in and you've held it so that everything has set up firmly, flex the surface back and forth to make certain it will flex without undue strain on the servo.
Do only one aileron at a time. Do each surface the same way. Don't dawdle yet don't rush either. You don't want the CA to set up too much before you apply to the other side since that may weaken the connection yet you don't want to rush so fast you make an unnecessary mistake.
In order to do this you need to be certain you are comfortable, can see clearly, and your CA tip is clear and ready to go, all hinges are in all slots, centered, and straight.
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You'll do fine,
Clay