Set the flaps to 0.
Set the airbrake lever 1 inch towards open position.
Close the water valve lever.

Prepare a wing support for the first wing.
Mount first wing. When in, standing at the wing root, lean over the fuselage and feel that the spar is in the horisontal middle of the hole. Fixate the wing stand and recheck that the first wing spar is at the rigt oplace, middle of the hole.
Mount second wing. Here it's up to the tip holder to feel the right height.

A little practice, and it's no hazzle.
Some Schempp Hirths are too tight Fit though.

Reg Per, v2ct