Not sure what category this would go in.

Not sure what category this would go in.  99% of our clients are Not on G+ so we do private coaching on the YouTube side.

Was watching the mastery teaching about the guest account and I'm having a hard time wrapping my head around this.  

Using private YouTube -  one way you keep it private is by entering the client's email into the "who can view this" box.

BUT, even on YouTube they have to have, at a minimum, a  gmail account.  For some clients that's can be an issue - they just don't want to set one up.

 IF I set up a guest profile like Ronnie did and get them in that way using That gmail account, can I then go back to the "who can view this" box on YouTube, remove that guest email and replace it with theirs??????