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VERY good points to consider. Fit is critical, and purchase without knowing what stock size you each might require, or whether you really require a custom fit, is associated with some risk.
I'm going to second this important advice about getting training from a good mentor or instructor .. before my training I never would have thought a drysuit could be so difficult/dangerous if you do not react properly in an emergencyGoes to show you that proper training is so valuable. Not just from a book, because an outline only goes so far. Real life experience from other divers, competent instructors, reliable information and getting into a pool to test stuff and PRACTICE before getting into open waters. Yes, try it in a pool first! If a dive shop doesnt let you do that - go to one that does! Would you buy a car never checking to see if it starts?