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You'll probably get a "HIGH TRANS TEMP" message at some point, but I have no idea whether it will happen in time to save the internals if it's caused by low fluid.
Yes, especially since I understand checking the fluid level is a very involved process!
It's trivially easy if you have a lift: just unscrew the plug and see if the fluid is level with the bottom of the hole.
Without a lift, the hard bit is that the car has to be up high enough to get underneath, level, and at operating temperature...not exactly a DIY-friendly job, at least not at my age.