Buying directly from a listing broker means they are representing the seller of that property and you as the potential buyer. If this is your first real estate purchase and you're unsure of any part of the buying process, you should first see if the advantages of working with your own broker will benefit you in this situation.
Since the listing broker is already representing the seller, they are likely to have more invested interest in the seller's objectives than in your own.
When negotiations take place, you need to ensure you're up to the job and not feeling pressured by the listing broker to take steps outside your area of comfort.
At any point if you're feeling uncomfortable, it could be time to walk away from the deal or enlist the help of another accredited broker to clear up any questions you might have.