It is a bit difficult, but it gets easier the more you do it. I have a pretty good method which goes quickly. I set the top wing on the pylon with the center bolt protruding several mm. Then I locate the hole in the pylon with the bolt and get it started in the blind nut. Then I seat the wing into the cabane struts and partially tighten the cabane bolts. Then tighten the center bolt and then the cabane bolts. The hardest part is locating the pylon bolt hole. I marked the hole location on the pylon so I can see it from the side as I put the win on. It makes it a lot easier to line up the bolt with the hole.