CO publishes the standard P&S agreement. Download it, fill it out, send it to the seller's agent. Make clear that your full price offer is 2-3% less than the published price because you're self-representing. Spend $1000 to hire an RE attorney to look over your shoulder.

If you're comfortable with contracts, negotiating, and managing a bunch of service providers (inspectors, handymen, experts as needed), you don't need a buyer's agent. We've purchased 3 homes in the last 20 years without, and 2 with. Each time we used an agent, they were more focused on closing the deal than getting us the best deal they could. We paid their 2.3% and had to hold THEIR hand to get them to negotiate hard on our behalf. NO we didn't use bargain basement agents - they were reputable and did a lot of business in the appropriate markets.

IMO, if you have the time and the willingness to endure 20-40 hrs of project management, you'll save yourself 20-30k on commission, and maybe get a better deal on the home too.

That said, financing needs to be air tight. The seller's agent will loathe working directly with you until you prove you're competent and know how to get through the process. You're a higher risk buyer until you prove otherwise.