I'll try to check out the exercises soon, but having a disability doesn't define who you are as an artist. But don't worry too much if you have to take more breaks, because having a disability should never stop you from achieving your goals in the artistic journey that you're on. Plus you can practice whenever you want to, you don't have to be afraid of anything, i know this sounds easier said than done but try your best to not worry too much. What you can do is start taking small steps to worrying less, something that I do is to look on the positive side of things instead of focusing on the negative side, for example, if i have a deadline for something and i have only a few days to finish it, I take advantage of it and remind myself that even though it's very little time it's still better than having no time left. Also, you're not the only one that's grinded on an exercise by accident, i've done the same thing as well and felt bad about it, but I took someone's advice and moved onto the next exercise because going for perfection is just gonna hold you back from achieving your goals. Anyways, I hope you find this helpful and to have a nice day! Remember you can always ask someone for help if you're unsure of something or need some advice.