Pete: "Hiring" an attorney is something you should do when you have work for him to do, just like hiring Joe the Plumber. Finding an attorney who will do a good job should start before you are ready to hire him, just like knowing what plumber you'd call when the water heater looks like the Fountain of Trevi. All attorneys are not created equal. Some know nothing about the Real Estate field. Obviously, you need one who does.
You will be involved in two contracts, the listing contract and the selling contract. Finally, you will have a closing where you will sign a ton of documents. If you feel experienced and knowledgeable, you don't need a lawyer for any of it! You will need to generate a Deed and Affidavit of Title. They are legal documents but can be arranged through a Title Company or can be drawn up inexpensively by an Attorney. You will not get any other legal advice if you choose that route.
I've never personally seen a case where an attorney was asked to review a listing agreement. It is a contract and there are standard ones in use in the state. If you feel up to it, review it with your selected agent. I'd ask specifically for an escape clause, so you can cancel if the relationship is not satisfactory to you. While I would cancel any listing if my service were not appreciated, many others will not and will hang on until grim death or the expiration of the term. The escape clause will put you in control.
I have had a listing contract that specifically let the seller cancel it upon written notice. The only thing that I would insist on as an agent is that I was compensated for my effort if the cancellation was requested. If the property went under contract, I'd expect that you'd stick until closing and I got the commission that I'd earned. I think that's only fair don't you?
Best of luck with your sale!