This is really the essence of the idea. Follow your bliss, and all that dippy shit, but know that your work is only part of a larger whole, and you need to be able to do good work, then turn your back on it and move on. There's a preciousness to things nowadays that is a bit galling. All work is done in steps, as a part of a system. Enjoy your work. Do it well. Take pride in a job well done. But do not treasure your work, or value it higher than the person that paid you for it. That way madness lies! :-) Yeah. People like working with me because I'm a personable guy. I know much better writers who don't get the work I do because they are hard to work with. Be good. Be patient. And be willing to release your stuff into others control. The trick to doing works for hire is to recognize that you are not the final arbiter of quality.
More importantly, your task is to apply your skills to the best of your abilities in service of what they want, not what you want.