To get the positioning of the other flowers right, carefully place your top tier on top of your base tier. Unless it's been incredibly humid, the overnight drying time should have made the tiers safe to handle without messing up thier smooth surfaces too much. Any small marks can be rubbed out, or covered with flowers or a little imaginative piping.
Once cooked, leave the cake to cool in the tin. When cool, remove from the tin and place on some baking parchment. Drizzle a couple of tablespoons of brandy (or your other chosen liquor) over the cake and wrap it up tightly in parchment and clingfilm or foil. Every few days unwrap the cake to feed it with another spoonful of liquor, then wrap it back up and return to a safe, temperate storage space.