I will say that I print out the plans in tiled format, since they fit onto an 8 1/2 x 11" piece of paper, then trim it down using a paper trimmer, to the appropriate sizes using the guide marks. Once that's done, I use a spray tack/spray glue (Michael's, Hobby Lobby, and Walmart sell it; I'm sure there are other craft/hobby stores that sell it as well) made by Elmer's, but there are multiple brands that put it into an aerosol can - and spray down the foam board, lay my sheets down as best I can to get them aligned on the foam board, and then start cutting out around the outlines.
I use a cheap flexible metal ruler along the long, straight lines for wing edges, primarily to help keep them as straight as possible; I think I picked it up from Harbor Freight? it's more of just a guide to keep everything as straight as I can get it for gluing together, and it works pretty well.