While you don't need an attorney to close on your property (the title company that you pick, handles that side), I would strongly recommend that you have an attorney representing you. I've bought and sold a lot of real estate in the lakes region over the past 10+ years, and have always had my own representation. Its not a lot of money and has paid dividends on a couple of transactions.
I've used Lee Mattson (in Meredith) exclusively, and have nothing but the best to say about him. 603-279-9940
A good surveyor is also a plus - IMO you should have your own done. Bryan Bailey - Turning Point - is a great resource,
http://www.bailey-associates.com/