One major obstacle can be finding suitable interviewees. Instead of knocking on doors, use groups that are already in existence. Over 50s clubs, mother and toddler groups or community halls can all be possible sources of interviewees. Get in touch with the organizers and let them know you are a student rather than a professional researcher. People seem keen to help students, although they can be wary if they think they are speaking to a journalist, so be open and honest about your intentions.