Make sure you show how much time you have had in doing the specific tasks so they can maybe consider that as job experience, and hope no one better qualified shows up. Also, write a cover letter describing why you feel you are qualified for the position, such as the fact that you have done all the separate tasks for x number of years. If you have worked in a similar or related field, that can sometimes be accepted as applicable job experience, and so can unpaid work. If you are applying for a government job of some sort they may be stricter about the specific guidelines than a private company. Also, if the job is with a small company there may be more leeway. Sometimes, if a position is with a large company that has a separate HR department or a governmental entity and there are a lot of applicants, the HR department will set up criteria for automatically disqualifying you from the pool of interviewable applicants. Good luck.