In terms of pricing high or pricing low - there are a range of strategies and a good agent will describe your options relative to market conditions and the marketability of your home.
My own opinion: there are a lot of bad agents in the world, but a good agent really does earn their commission by understanding the market, how to present your house, will project manage a range of things that have to happen in every transaction, and will ultimately work to get you the best outcome possible. If you don't believe any of the above, I fully recommend you find a different agent.