I worked the training edge of the right flap. The technique I used on the skins was to align the top skin with the main spar then drill that into place the work the nose ribs aft to forward. For the main rips I started in the middle and drilled the forward most hole on each rib. Then start in the center and drill the second most forward hole in the rib. it was tedious but the results turned out well. I have just the left training edge. Then deburring cleaning priming.