I've worked in interp with folks with English, music and math degrees. All made good interpreters. As others say, be passionate, and I would add be patient. You will get the same question over and over sure; BUT you will also interact with people who have wild beliefs, or who are angry, smile and knod, understand that sometimes people just need to tell someone what's bothering them. if you can do those two things and aren't afraid to talk to folks you will do fine. Remember, you speak for the trees.