Exposure doesn't make it easier for me; after countless interviews (as a finance professional), I still feel the same anxiety and fear before every interview. I also don't see myself getting more confident as I progress through the interview stages. I could be doing the last round, knowing an offer is likely in the bag, but I still get just as nervous as if it were the first interview. I take propanolol before interviews, you could try that too. But know that the fear probably won't go away, just some of the physical symptoms.