Former real estate appraiser here, though I only did commercial property, not residential. The laws and regulations vary from state to state and even within states but there is virtually always an appeal process for property taxes. In almost every case you as the homeowner can present your case or hire someone to do it on your behalf. In the latter case they usually work on contingency and take 33-50% of the savings. So if you get your assessment reduced from $190 to $180k that's probably not going to be enough of a difference to hire someone.
There are usually a few ways you can appeal a property tax assessment. How much information you will need to provide and in what method (an online form, a letter, an in-person hearing, an independent appraisal, etc.) depends on your local jurisdiction and should be spelled out somewhere on the Assessor's website.
1. Correct actual errors in their record, i.e. wrong size, year built, number of beds/baths, construction material/type, etc.
2. Provide proof that your house or one extremely similar sold recently for a lower price. This is much harder if it's not your house and a recent sale as there could be any number of factors such as a distressed sale, recent renovation, different options chosen from the builder even if the home looks identical from the outside, etc.
3. Challenge qualitative differences i.e. Assessor rated your home as "good" condition but it is 50 years old and still has the original finishes that are worn and outdated so a condition of "average" or "fair" would be more accurate.
4. Challenge the overall fairness, i.e. a model-match home down the street is assessed for less than yours. In theory they should be identical.
