By the way, if you want to really prepare your missionary by giving him or her a true picture of what it's like, I recommend two things. One, read Sis. Kerry Jo's Mission Blog (or follow her on Instagram @sis.kerryjo). Secondly, pick up a copy of Arie VanDeGraaff's Mission Daze (available at Amazon.com). Between the two of them, you'll get a really good idea of what to expect.
And good luck to my padawan, who enters the MTC today. Go forth and do good things!