Honestly the easiest way is to talk to yourself like make up random situations but its important to make peace with it otherwise itll make you mad which will make it harder for you to talk its basically a loop you gotta get out of its not going to be easy but you can do it you should also let your mom know about the phones call just have her sit down with you and as you talk try to kind of have a rhythm to what you say as this will make it less of a chance that you will stutter good luck man