I can attest to the driveway method for husking the nuts, but if you intend to try to harvest the meat, I can also tell you it's a LOT OF WORK!! Black walnut is more like hickory nut, very hard shell (that's why you can drive over them) and not a lot of meat inside. Nothing like an English walnut.

.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!