I fished in Canada with my father from 9 to 19. Lake of the Woods, Rainy Lake, Winnipeg River. Never fished in Wisconsin or Minnesota. We caught many walleye but most were in the size class that they call "eater." 13 to 16 inches. Here those are not legal to keep. We must catch fish 18" and longer and we are limited to 4.
On the plus side, the fish live longer and grow larger here. I have two over 10 pounds out of Table Rock.
On the negative side, you must target them and work at it.
Four main techniques work for us, depending on time of year. Jigs with trailers, trolled crank baits, night crawlers with harnesses, and jigged spoons. I became serious about the walleye about 6 years ago and feel I am just beginning to know a few things. Your friend and his knowledge would do well at certain times of the year, but would need 2 or 3 years to adjust.