just switch the lights and your good to go. If you were to undo any hooks or ties, once the plant starts to grow you lose the shape you've trained them to grow in the first place. Then it starts to grow all funky and cover up the spaces that was allowing light to the lower buds.

Once you start flowering I would even tie each of the colas back a little bit to open up the canopy and expose the inside of the plant so more bud will grow. Think of it like when you lst your creating a 'claw' shape for the plant, and you want the claw to open.