A couple of things. When you and your husband (or one of you) purchased the property (the land), you should have received a warranty deed from the seller. When your husband died, if he left a will, you should have had his will probated, and presumably he left everything to you, including the property/land and whatever was on it (house trailer, half-constructed house, etc.). If he did not have a will, his property probably passed 100% to you - but it depends on if he had children that were not also your children. To pass title to the property to the next person if you want to sell it (or just clear up the records so it won't be a mess for your heirs), you will need to have an affidavit of heirship concerning your husband. You might be able to get away with doing this without the probate court, but might not.
I'm not sure from your post why you need an appraiser at this point - are you trying to argue the tax valuation? get a loan? get fire/flood insurance? Not a bad idea to do this regardless but perhaps you have some reason. You can hire a residential appraiser familiar with your area to perform such an appraisal and use it for all those reasons.
"you had the property changed over to your name" - this was presumably in the county tax records.
Since there are so many fact-specific questions/answers, you should hire a local attorney that handles both probate and real estate matters to advise you on making sure title is clear to you from your husband's estate (or advise you what the situation is). If you're thinking of selling the property, you should talk to a title company that would issue a title policy when you sell the property to the next owner about the title company's requirements.