I bought one of the top of the line drysuits....and learning to use it is easy if you have diving reflexes, and at least chat with some dry suit divers... Easy to use the dry suit with mediocre skills--the way most dry suit divers do it--with way too much weight, and easy release of OVP air in the suit on ascent....to do it aT a Cave level, with precision buoyancy is still something you can learn yourself, but you need a lot of practice with much less weight and lots of ups and downs...
Personally, I hate using a dry suit...they are the GARBAGE SKOWS of exposure suits for drag in the water....expect to go less than half as fast with your dry suit on, or to work twice as hard to go the speeds you went before. In some dive sites, this is irrelevant. In many higher current areas with cool structures and lots of fish, it is a huge disadvantage to wear the garbage skow suit. I would rather be a little cold in my wet suit.
And I have NEVER seen a Dry suit diver that is not poky on dives...it is not their fault---there is just nothing they can do about it other than to use a high powered scooter.