IMO learning to dive with a drysuit is overly exaggerated if you are already a proficient diver in terms of buoyancy and ascent rates. Open the valve and go diving! It that simple. The day I received my drysuit I muddled around in 30 ft of water for 3min and then continued on a 40min deco dive fully kitted with stages.
That's fine, but a little too cavalier for my liking. I need to understand the intricacies of the suit before I start going back to deco-diving. Add in Colder temperatures, the need for helium in dark UK waters, stronger tidal ranges and figuring out perfect weighting for either Twin Fabers or Euros then I would need more than one dive to start getting comfortable with a deco schedule.
Divers that struggle with drysuits (generally speaking) have bad buoyancy, use wrong size suites, try to use the suit as buoyancy compensator, exceed 30ft p/m ascent rates, or have extremely bad breathing patterns.
I would be seriously surprised if you struggled with a drysuit!!
I have photos of me in my drysuit, my trim is fine, any my breathing spot on (SAC abnormally low as per normal). However I've tried to describe the sensations of diving in drysuit, rather than mistakes. As of yet I haven't been shot to the surface, but I have had the warning from my suit and reacted to it, when compared to wetty this is a new sensation, problem would be if I wasn't comfortable diving dry, I am, its just new and I shared that experience.