John Chandler

Hi all, I am new to this so please forgive my ignorance. I wonder if you members can help me please. My wife and her sister have just inherited a collection of what I think are guineas, lots of sovereigns/half sovereigns and sets of sovereigns and also lots of pre decimal coins dating back around 300 years. What is the best way to go about valuing all this? What are the pitfalls or people/tricks to avoid? What is the best way to sell? Maybe to an individual/s or through auction as a lot. Any help would be really appreciated. Thanks John