What is the most logical next event?

How to tank a wall
Remove shelves, curtains, and artwork from the walls.
Unscrew shelves and fixtures from the walls before you tank it. Move wall fixtures and shelves to a different room while you work.
This will make it easier to apply the tank mixture in an even coat and will prevent splatter from getting on your fixtures and shelves. Don't forget to remove any screws or nails that were holding things up on the wall.