Personally, I say stick it out for a little longer. 10 days isn't enough time to judge a new job imo, especially since you've only done the training. (Unless it's significantly affecting some aspect of your life, but it sounds like you're on the fence about it anyway). By all means, if there is another more favourable opportunity in your life right now then take it. Or if it's getting to the point where the job is negatively impacting your mental health significantly, then it's probably not worth it. Stick it out for a month or so then reassess. Who knows, this could an opportunity to truly come face to face with your stutter and address it like you never have had to before. Even if you decide to quit, you get to say to yourself "Well if I can do that, then I can do anything". But I don't think quitting after your training is doing yourself justice. Just my opinion though. You know yourself better than anyone, and at the end of the day only you have to live with the consequences of your decisions. Keep us updated on what you decide to do, we're all rooting for you!