Just be honest with yourself if you think you could do the job. If so, apply. If you get an interview, then Google how to do the job and watch some videos about that position, the software that is used, lingo, etc. 90% of the people interviewing you will have virtually no idea what the job is, they are just asking questions to see if seems like you think you know what you are doing. If you get the job, even if you DO know how to do it, still Google how to do it and keep learning and mastering it. The only people who perfectly know how to do a job are usually those who are ready to move to a new position or ready to retire.