My first bout with diving doubles was a disaster. I was unaware of the incredible negative buoyancy of my double LP85’s. Thinking as a recreational diver, I dumped all the air from my wing. I took a 20 second ride from the surface to the bottom of the quarry at 95 ft. Thank goodness my ears equalize easily. Made a nice mushroom cloud around me! :) . I spent the rest of that year diving in the "kiddie pool" section of our quarry (20 ft or less of depth), learning to control those beasts on my back. I eventually graduated to double 108’s over about 3 yrs. I would suggest to contact a technical instructor,... Let them go over your equipment- give you the pro’s & con’s. Then get into a pool or very shallow water & find out where your balance & trim are. Get them lined out. If your drysuit is new to you, get lots of experience in it first. You do not want to be dealing with too much new things. Change things, 1 thing at a time, or you may find yourself overwhelmed & frustrated. Take your time & see if you can connect with a technical instructor in your area or someone very well versed in technical diving that may be willing to mentor you.