When you are a self-published author, you've got to be your own boss. That meas being hard on yourself, sometimes. You've got to tell yourself to get to work when that great movie is on cable, say "thanks but no thanks" to certain social outings in order to get more done, sit at the computer screen to write when you'd rather be on Twitter. But it is possible to be too hard on yourself. Can you be too disciplined?
Driven
The indie author game moves quickly. New books are published every single day, and new authors are appearing on Twitter like an ever-recycling magic trick. You've got to keep tweeting, keep blogging, keep publishing and keep staying active if you want to stay in the game. And when you also have to work a full-time job, maintain a social life, keep up some degree of a family life and still take care of yourself, you've got to be driven. You've got to stay motivated. You've got to keep working.
Because you've got to do all this, you can start driving yourself a little too hard to get it all done. And I ought to know. You can be too disciplined. I know, because I am.