Indeed! I never really do stretching, but you should do whatever you feel works for you. It's all about gaining confidence as well. With Bread. If I block on Br, I will tell myself: "Already said Br, so now move on to Ead". Ead will most likely be not problem at all. So it all comes dones to consciously telling yourself to move on in this situation. It takes time to get used to. But you should always look what works best for you. I did, however, try slowing down my speech. Speaking very slowly. Works well for me!