what's the proper technique for edge jointing two 8/4 boards with a hand plane? the widest plane iron i have is 2" with a slight crown, or camber to it... would this work or is it best to have a squared iron? i've jointed boards that when clamped together were still thinner than 2" but i'm not sure if that also works in this case, and the wood is close to it's final width so i don't wanna mess up and wind up with wood i can't use... thanks for all the advice