Are they certified (CRS)? Do they have advanced certification beyond basic requirements? GRI, ABR, SRS, etc. This is an indication of commitment to the profession and their level of expertise.
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Ask about their approach to marketing your property, including online presence, social media, professional photography, staging advice, videos and open houses. You need more than the old school effort of just putting a sign in the yard.
A strong local network of contractors, appraisers, lenders, handymen, etc can make working through problem areas easier.