Effective communication is a very important skill which you must learn if you want to move ahead in your career. No matter what you do and what your intentions are but if you cannot communicate effectively then, your whole idea of progressing will fail.  
 
You cannot tell your plans and goals without an effective communication technique. If you are confused while explaining something then, people will think that will also be confused while attempting that thing. This is natural gesture which every normal person will give you.