No problem! My sisters and I were showing together, and with my mom overseeing three girls and three horses at every show, it took some creative planning skills to get everyone ready in time. I used to have to braid my sisters hair too...they hated it because I always plastered them with hairspray.
Do you braid with bands or yarn? It's a little messier leaving yarn braids down overnight, but other than the sawdust and hay, it's not too bad.