Pre-payment only required for remote sessions, cash or Paypal for in-person appts. No checks please.
Most new people to WordPress cannot absorb more than 1 hour of tutoring, as its simply to much information. Folks who have some experience can go 2-3 hours.
So a good way to start if your new is prepaying 1 hour only. When the hour passes, and you feel ready for it, I’ll bill you for more time.