I was wondering if anyone has tried this yet? I'm going to attempt it later tonight when I get off work.. I'm not so sure of the rules but I know you start with a household with 1 adult sims an...
I'm doing alright (so far) without nanny's, butler's, or help from anyone else.
ProTip: Put them on the potty and then click off and walk away to train another. They'll stay there (and get attention if you're in the room!) until they're doing 'going'