By law the lender must disclose, before you sign the loan agreement, any charges, fees and interest rates with regards to the loan. If you don't feel that your questions were answered or if the answers seem vague, consult another lender before moving forward.
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.