Generally, the regulations are voluminous and require a bit of study. You'll find regulations and licenses at any sporting goods store that sells fishing equipment. Many books have been written about fishing in Greater Yellowstone. A few of them are suggested in our Resources section at the end of this book. Hiring a fishing outfitter can solve several problems for visiting anglers.
Local guides have the local expertise that makes record catches more likely.
They know where the fish have been biting and what they've been biting on. They know the regulations, so you won't accidentally end up on the wrong side of the law. Plus most guide services supply transportation to and from the fishing area, a boat, meals and drinks, and sometimes even equipment. If equipment isn't available to loan, it's generally available for sale at the outfitter's shop. Package deals that combine lodging or breaks for additional people are common.