1. Look for a certified appraiser: Consider using a certified appraiser, as they have undergone training and have demonstrated expertise in their field.

2. Check for credentials: Check to see if the appraiser has any relevant credentials, such as membership in professional organizations or accreditation from a recognized body.

3. Look for experience: Consider an appraiser with experience in the specific make and model of your car, as they will have a deeper understanding of its value.

4. Ask for references: Ask for references or reviews from past clients to get an idea of the appraiser's reputation and quality of work.

5. Get a written report: Make sure to get a written report detailing the appraiser's findings, as this will provide a record of the appraisal.

6. Consider the cost: While cost should not be the only factor, it is important to consider the fees charged by different appraisers and choose one that is affordable and fair.

Overall, it is important to do your research and choose a reputable and reliable car appraisal service to ensure that you get an accurate and thorough appraisal.