Typically a real estate lawyer will charge by the hour for services you need. The lawyer is not an agent and does not get paid a commission, and there really is no good way to deal with a contingent fee, so I would expect you would be paying by the hours or a flat fee arrangement. The lawyer could review your documents and make sure they are in order, and could help you negotiate a sale...although you probably will be contacted by a buyer's agent. If I were you I would talk to a title company. Using a competent real estate agent to represent you can make this a lot easier...although it does cost. Good luck!
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Best practice is always to have a real estate attorney and a broker working on your behalf. They understand the markets and can walk you through any issues that arise during the sale. However, If you want the hands on experience, but its your first sale, it is best to have at least one or the other on your side so you have someone to bounce ideas off. I recommend having a real estate attorney review the situation and give you an opinion on how he/she would be of help to you.
If you are not interested in hiring a real estate broker who knows what they are doing, then you may need to hire a lawyer to handle whatever pieces of the process you cannot figure out for yourself. Generally, you will pay the attorney an hourly fee for whatever tasks you have them take over for you. Depending on how much of the process you are handling yourself, using an attorney may or may not be less expensive than having a real estate broker handle the transaction for you. One difference is that if the transaction doesn't close successfully you usually don't pay the broker. You will need to pay the attorney for the work they do whether or not your sale is completed.
Legally, the most important thing you need to do is to get a solid title company to handle the closing and provide title insurance. Colorado typically has tile companies rather than attorneys handle closings and most of your protection in the sale comes from the title work and title insurance.
You can reach Harkess & Salter LLC at (303) 531-5380 or info@Harkess-Salter.com. Stephen Harkess is an attorney licensed in the state and federal courts of Colorado. This answer is for general information only and does not create an attorney client relationship between Stephen Harkess or Harkess & Salter LLC and any person. You should schedule a consultation with an attorney to discuss the specifics of your legal issues.