David Watt

Focal Press http://www.focalpress.com/audio/ is a good place to start. Many of their texts are on first-year undergrad music and sound courses.

Best piece of advice I ever received: It will never be 'perfect', you need to know when good is good enough. In answer to your question, I am never satisfied but I need to know when to leave something otherwise it would never get finished. How to you get that? With practice (repetition). HTH.