First, begin with reading. Daily read aloud some book, it is best if it will be some artistic novel, full of expressive means. Give this exercise 10 minutes each day. Only with such frequency you can achieve results. This exercise will allow you to accustom yourself to talk out loud. Don't forget that the most grateful audience is children, read them books. If they listen to you, then you are making progress.
You must have a favorite announcer on radio or television. Start to imitate him. Record his voice on tape. Study carefully the manner of speech of your idol. Then compare your voice and the voice of the master. Special attention should pay to the pronunciation of consonants. Remember that there is no limit to perfection. Only hard work will help you to achieve success.
The most effective way on the way to good diction are tongue twisters. Don't overloading. Start with simple tongue twisters, only gradually move to more complex. Create more problems for themselves in the process, for example, pronounce tongue twisters with your mouth full. This will allow you to achieve more success. Try during a call, not to grit my teeth and not to "swallow" the end of words, in this case the interlocutor will be difficult to understand you.