This is a good question. It might depend on what your goal is. Generally speaking, reinforcing unproductive behaviors such as forcing out words or using a lot of tricks because you're so frazzled and overwhelmed isn't good. But if you set a goal of facing your fear or saying everything you want to say, that could still be productive. You want to leave the experience feeling like you took a small step towards progress, even if you you leave the moment feeling bad/shame/negative. But you can mitigate that by preparing to feel those negative feelings, such as in the goal of speaking up. You might tell yourself, I want to face this fear and answer a question. You can make clear for yourself: my goal is to face this fear and speak up. I may feel shame and embarrassment, but that's ok if I feel it's moving me towards my greater goal of challenging my fears, desensitizating to the physical and emotional feelings of stuttering, and saying what I want to say. I will say though that this is difficult to work on in the best of times, but especially difficult if you have a lot of struggle and tension. For that I would seek a great speech therapist who understands stuttering and knows how to help those things (not fluency shaping).