Be sure you read the manual carefully a couple of times before starting assemby.

Also inventory the parts and label them carefull so you won't use the wrong part at any time. I find a small piece of masking tape with part number or description on it help a lot.

Then separate the wing parts from the fuselage parts (can be done while marking) so you won't be damaging some parts while looking for others. Keep careful track of small parts and any hardware.

Above all else, TAKE YOUR TIME, test fit carefully BEFORE applying glue. If the part is going to require pins, clamps or tape to hold it where it belongs be sure to have them ready before applying the glue