I'd like to encourage you to aim to work through your mix in a swift manner. It has been said that you only get a few hours of critical listening per day from your ears in a day so before you begin make sure you first organise your project nicely, have a clear idea of how you want your mix to sound, find your reference material, and then you are ready to get stuck into the fun part. Mixing can be tough if you are too much of a perfectionist, and this can become an unpleasant experience. Over listening and working for too long can ruin your perspective, as well as being unenjoyable. Try to be confident with your decisions, don‘t over listen to parts, have faith and dive in, and keep it moving!