Simple...... Just don't let the guide out fish you. In all honesty we are humans after a fish. Why let someone intimidate you. He is on the same water at the same time.
Well, when a guides job is to be on the lake 7 days a week and is paid for it while John doe works a 9-5 m-f and gets out there every weekend don't you see a huge advantage there?
But, at the same time, when you sign up for those tournies knowing guides will fish it then that's on you.