The ones advertised in the trades involve sending in your picture and resume. They may call and set up an audition. Another situation is an open call with a picture and resume. I would recommend going on as many auditions as possible without any intention of getting the job. It is exercising the vibe of auditioning. I have been out of the industry for about five years. When I am ready to go back I will go to class, look in the trades, and go on auditions for stuff I don't even care to get just so I can build my ego and self-confidence back up. I will work on my audition skills. There are definitely skills you need to hone. You need to walk into a room and feel good about yourself and know that you are doing them a favor by showing up. There's nothing there they can offer you that you need. You have to walk in there feeling your life is complete without them. You can't go in with a sheepish, low self-esteem. You have to feel you don't really need the job. You don't go in with arrogance, but with confidence and a willingness to help them out with their project. You do your audition for yourself so you can feel good about yourself and your skills. You have to feel that if you help them, great, if not, fine because you won't get the job being what they want you to be, you will get the job being who you are.
