You might ask someone who is proficient on a screen reader to explain the same actions from a screen reader user's perspective. No matter how clear your alt text is, a Mouse and vision won't be the way everyone navigates the same series of actions. But, some that rely on alt text do navigate visually. The text that accompanies the images should convey the same actions as the pictures. You should almost be able to follow from text alone, from images alone, the alternative text can give extra details about where on the screen the actions take place in relation to the other visual objects.
"Click the OK button, found on the lower right corner of the pop up window."
(Screen reader user's can follow a link to the tutorial for users of screen readers.)
...I like to outsource that kind of task to people in the community, staff or students, who rely on screen reader technology , and would welcome the opportunity to utilize their expertise to make a project more accessible and get paid for it.
Hope that helps.
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