simple situations. For instance, before asking your chief about adding to your salary, try to voice your disagreement to a waiter in a café.
• When speaking, hold yourself upright, looking to the eyes of your interlocutor. Avoid nervous smile and giggling when talk to your chief. Don't pass to whispering, try to speak by your usual voice.
• If you are going to have an important conversation or public speech, think over key moments beforehand. It would be nice also to have some "billets" which you would be able to use during the conversation.

No doubt, to have success in your work you should constantly perfect yourself, but these basic ideas can greatly help you in achieving the first results!