An attorney can review your real estate loan paperwork to determine if you are really getting the best possible deal as well as prevent you from agreeing to any terms that are not standard within the industry. Usually the attorney will save you money over the long term, more than paying for his or her fees.
Your real estate agent may recommend a lender or real estate loan provider, which is a good place to start. Keep in mind that you don't have to use this person or company and shop around to see what other lenders are offering before signing any loan agreements.