Yes, but not necessarily from scratch. A good personal assistant should already know how to do basic admin, communication, and scheduling work; The training they need would be more alignment to your preferences, as in how YOU like things prioritised, the tone YOU usually use in communication, or which decisions they can make alone or what they should flag to you first. As such, when hiring personal assistants, expect a short onboarding period where you’re correcting and clarifying more than usual. That investment is what lets them start making accurate judgment calls without you.