Let your works speaks for you. A lot of times, people go about saying things that they are not supposed to say, simply because they want to create an image for themselves. They reveal too much and become vulnerable to attacks because they say too much.
Sometimes, you do not have to announce who you are, or what you can do. Let your works speak for you. Allow your works announce you. Be the silent achiever. Talk less and achieve more. People do not really care about what you tell them you can do, they measure your capabilities from what you have done.
Instead of wasting time on the talks about what you can do, focus on doing it and your work will automatically announce your prowesses.