Well, it's not like I can fit in a tub and completely lie down and stretch out and all. Usually when I want to get my head under the water, my legs will be well up and out of the tub leaning against the wall or whatever. Not really an uncomfortable position, though, so you basically just need enough room for your torso and head to pull it off.

Well, either way, if you want to get all the kinks from the braids out soaking it in the tub would probably work far better than a shower would.