Sorry I did not get back to you sooner. I hope that all went well with your Drysuit cert dives. It’s really very simple. You just have to realize that you are now dealing with two buoyancy control devices (BCD & Drysuit). Don’t worry, after a while it will become second nature to you.
I like my neoprene suit. However, many people swear by DUI drysuits. I have dived them before and they are great (if you can afford one). The only problems that I find with Trilams or shells is that they tend to be less streamlined and they require a bulkier undergarment.