Know about your company’s policies:

Knowing your company’s policies on workplace harassment will make you much confident even if you do not need to use them. Owing to being bullied in their past, many of them have the affinity to give back the same to make themselves feel better and proud. They will probably turn to put others down while becoming another bully. When it goes worse where you cannot handle things with you, it is sensible to follow formal procedures which your company holds.

Find out the official hands to support:   

It is always better if you can find out people who can officially help you on this. It may be HR department or a mentor. Ask their help. When it comes to egoistic boss, you should be aware of opening your mouth against him as he will have many holdings than you in the organization. There will not be anyone to trust unless they feel same about the boss. If you say something against your boss, you should keep in mind that there is no guarantee whom to believe or whom to not.