Yep, pretty much. Clean, dry, and then later degrease. If after the skins are dried there's any flesh or fat left on the flesh side, you can gently sand it off. Sturgeon skin is pretty stout. Its like deer rawhide.
On the day I go to use them, I soften them by rehydrating in some in luke warm water and Dawn dishwashing liquid and give them a good scrubbing on the flesh side to remove any fat and grease. Then rinse well in fresh water, pat dry with towels, and let them air dry to let excess water evaporate while I finish getting the other stuff ready.