I used to be an Apple accessibility advisor and my favorite part of the job was teaching new users how to use VO. There is a dedicated line to call 24/7 and the advisors are trained specifically to assist VI users.
Link for how to contact at bottom of this comment.
Many of my former co-workers and myself would spend time with VO enabled on various products with the screen disabled so that we can understand how navigating works while using VO, as much as a seeing person can at least.
Unlike traditional support structures, the accessibility advisors are there to help provide how-to support and not just to fix things. I cannot stress how dedicated the team is.
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