Start by interviewing people who do have experience in the field and determining to what extent they feel the pain for the problem you're solving. Your biggest risk with an idea where you don't have domain expertise in is that you're solving a problem that doesn't need solving.

If after speaking with a number of people in that field, there is a strong sense of validation, then you might consider moving forward on attempting to execute the idea but before doing so, I'd recommend you talk to me or another well-reviewed Clarity advisor to ensure you are well equipped to move forward on the idea.