Pins help a lot on building. The way I use them, I first PIN the plans on a soft top table. Then PIN wax paper on top of the plans, so glue wont damage the plans. Then I PIN the lower spar on top of the plans. Then PIN the ribs in their position on top of the spar and tack them with CA glue.... so on and so forth.... It helps to have everything aligned the way it should.

Hope it helped