It will probably take more than 3 months. This is a complicated issue. You want to make what you are doing while you practice in the moment become a habit which trust me, takes a lot of time. I would suggest reading aloud for an hour a day reading slowly and pausing a lot. When you do this for 2 months you will start to feel confident before you start your day. Try to always speak slowly and softly, that has helped me the most. It takes a lot of mental effort to do it but it did help me.