The wrong agent will probably not have the necessary expertise or work ethic to either answer your questions or solve the problems you will be required to face. Every real estate transaction is different. Selling is different from buying. New homes are different from established homes. Neighborhoods and communities are different.
Condominiums are different from single family homes.
Expensive homes are different from more modest homes. You may have received recommendations from friends or family. You may already worked with an agent in the past but you can be sure your next real estate transaction will be different from those previous transactions. Maybe the previous agent you used to buy your home is the right agent or maybe the wrong agent. Maybe that agent that sold your father's home is the right agent or maybe the wrong agent.