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You learn to wait until the last minute to fully suit up and then be very efficient at getting it on and closed up. What helps is if you can go and get in the water immediately after zipping up to cool everything off and then put your kit on. This is normally only an option for shore dives and if your buddies are slow. Depending on the site I'll hose myself off while waiting... hot and being in a plastic bag with thick pajamas on really does suck up top
I've dove with mine twice (third time tomorrow), so I'm by no means an expert like some people on here and there's always the standard answer of it depends on your cold tolerance, but I've been using this as my guide: https://fourthelement.com/brochures/temperature-layering-guide.pdf
Put it on with your base layer and undergarments on. Make sure you can bend and reach. It will feel stiff and snug at first until it's broken in. The waist should be a little bigger than you. Same with the legs and arms. Arm length will depend on of you had dry glove rings installed.
