Focus on the End Result
The most important things to keep in mind when dealing with an overbearing boss are the end results that are motivating his behavior. Most likely, a demanding boss is focused on delivering results for the company for which you both work. And your focus should be on delivering excellence in your position. If you are in sales, you need to focus on producing profitable revenue by delivering superior customer service.
If you find that your focus is on avoiding or appeasing your boss more than on your customers, then you will be making your job even more intolerable by exposing yourself to disciplinary action or dismissal due to poor performance.
In keeping with Tip #1, something magical happens when you deliver results above the expectations. Difficult bosses seem to become easier to work with and for. You enjoy going to the office each morning and your work experience in general improves.
The reason for this magic is that unless your boss is simply a terrible supervisor, he will have little reason to give you an especially difficult time if you are overachieving in your position. Those who perform make themselves almost indispensable while under-performers find themselves spending more time in the boss's office and more time worrying about how much longer they will be employed.
Avoid Group Gripe Sessions
Discussing how much you dislike your boss with your co-workers may make you feel better, it does nothing to resolve anything. Most group gripe sessions are filled with criticism, negativity and anti-productive, time-wasting conversations, during which nothing of value is accomplished. Any time spent during work hours (or even after work hours) that does not increase your ability to deliver results and advance you towards your end results, is to be avoided at all costs. Sure, joining in a group gripe session can give you some support and build bonds with your co-workers, you need to focus on your career and not only making friends.