Interviews can be intimidating. I don't know very much about select mutism so I apologize for that. My suggestions are to read up on interview questions and answers. Think of things you have done in this format event-what was going on, action-what you did and result-the outcome. Keep things simple. Relate any of your experience and translate those into transferable skills. How organized, friendly, detail oriented, multitasking, etc. And explain how those qualities relate to the job. As for the select mutism. How do out cope with that? Can you practice or do mock interviews with someone to be able to speak during an interview?

Realize an interview is for you and them. You are interviewing them as well as they are interviewing you. Bring a notebook with questions you want to know about a position. Also it makes you look like you are really interested. If you need to pause before an answer that is ok. You will most likely appear to be really thinking about the question. Fully taking it in. If you are nervous keep your hands folded in your lap and sit up straight. Try to smile and make eye contact and shake the interviewers hand if you can.

Other suggestions are to Google mental health recovery type places in your community. They might have more suggestion and help with finding the right type of work for you. They might also have interview techniques that would be better tailored to you. Also if you have a disability you may qualify for accommodations. Do you have a doc? I would also check there for suggestions. l I hope some of these help you.