i was leery of making my blades too. it was actually not too bad once i found something that worked for me. i intended to rough them out w/ a draw knife, but when i couldn't find my sharpening stones, i changed methods.
after making all of my marks, i took a hand saw and cut across the face of the blade, just above the marks. i tried to cut carefully so it was flat and even across so i could use the cut as a guide. i made these cuts every inch or 2 down the length. then i took a chisel and and hammer and, starting from the tip, knocked the pieces of wood out between the cuts. after this, i took a spokeshave and just shaved it down. i wanted to stay just high of my marks and final sand down to the level, but i always got carried away and shaved to the mark. the spokeshave made much faster work of this than i expected. after the front was done, i repeated on the back, and carved the airfoil w/ the spokeshave as well. the trickiest part is near the root where the blade tapers rapidly back to full thickness, but after a little trial, i found a decent way to do it.
the 1st blade took maybe 2 hrs...the other 2 took an hour or less each. these were only 2' blades tho. they are working pretty good too.
i'm STILL leery of making 5' blades, but i'll probably give it a go.