You don't need a guide, you need Greg Brune (goes by South Point) on CDC. I believe he fishes the Missouri mainly for cats but the dude flat out knows how to catch them........in rivers, lakes, sloughs and presumably, bathtubs.
Might save you some $ and make you a friend.
One caution though........don't let him bring his daughter along (aptly named "Kat") as she will outfish you, your friend and her dad!
U