Pros and Cons of Field Guiding

What are the pro's and con's of the Field Guiding Industry? What should you as a guide need to be made aware of? Why did you choose to become a Field Guide? What are your best and worst experiences? What would you tell a new Field Guide about to enter the industry?

Make sure that you look at the lodge you are about to start working at through the eyes of a person who will be living, eating, sleeping, playing, working, relaxing and generally existing there for extended periods of time. I hear of so many guides making a decision based on the heart and not the head.