Ditto. Reverse "whine" is a natural occurance for most cars w/manual trannys.
You'll quickly learn, as you practice downshifting, what gear to hit at what rpm. You'll even get to the point of being able to do so w/out overtly thinking about it. Just be careful as you begin practicing.
And, like I aways tell my daughters,
NEVER hit 1st gear while rolling. Come to a complete stop first. And, only morons go from forward to reverse w/out coming to a complete stop first. Leaving
tranny parts on the concrete is never a move you wanna make.
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daughter owns '00 GT, bone stock, black on black, rag top
dad services and maintains, and researches mods