how does one go about tranfering the nameservers to your hosting company once the customer signs up -- ie. you do it for them?

thanks

You would need to login to your registrars control panel and set the nameservers to your hosting nameserver, most registrars allow you to do this automatically but it can take some time.

If you did not register the domain for them they must go in and set it themselves, it's really really easy believe me or they could give you their password...which in my mind would be really foolish but maybe thats just because i'm a security freak.