This is the sort of reasoning that people say that pay for the used car salesman's boat.
You are going to buy, what, 5 houses in your life? If you're a big mover.
Real estate agents spend their entire life doing the thing you do once every couple of years at most. Why do you think you'd be better than them?
This is like saying that you, as the person who walked out of a 48-hour boot camp, can code that JS program better than the veteran programmer because she doesn't specialize in Javascript.
You want to spend 6 months doing research? Real estate agents are spending years! There's a bit of principle-agent problems when working in this, but still. Beyond the information parity, there's simply knowing how to do sales and getting people to sign the contract.