If you're referring to a mechanics lien claim for construction work, this article should be helpful for reviewing options for moving forward and having that lien released: A Mechanics Lien Was Filed on My Property – What Do I Do Now?
If a judgment lien has been filed against your property, the fastest and easiest way to have that lien removed would be to have the lien claimant remove the lien themselves after paying the relevant judgment. And, consulting with a New Hampshire attorney will be helpful for sorting through your options. Here's a list of lawyers who might be able to help - though, they all work in construction and real estate: Find a New Hampshire Construction Lawyer.