"Of course it is. Mind and soul magic are some of the most complex and dangerous areas of sorcery you could ever dabble in. If you didn’t have to, I’d advise you against doing so in the strongest language that I’m capable of. But reading between the lines of what Lily has said, I have to insist that you be very, very careful with this, Hermione. Don’t do anything unless you’re sure, and definitely not without me there to help. Promise me."