
The second, paid hypnosis sessions, is unlocked in a conversation with Bree after you've hypnotised her enough times, and only requires that you be able to hypnotise people. The first, tutoring, is unlocked when you check your emails after your first class, and also boosts your GPA a little, but does require you to keep your GPA high enough. There are three main reliable income sources in the game. Participation in psych experiments doesn't come up often enough to pay the rent, but the first one does unlock some plot, and does give you a little money. Happily, there are several ways to make money. In fact, you can barely get the plot started without needing to spend a significant additional amount.

While you can live off sandwiches and sufficient sleep, buying the Lunch Special in Bree's presence lets you eat with her (and doing so the first time unlocks some more things and gives you a useful tip), and there are a bunch of other useful things to spend money on. Money In the early game, money can be tight. Something like three times out of four, when someone gets stuck in the game, or can't find something, it's because they haven't talked to Bree enough. She's also a good source of information about several of the characters you'll run into. Particularly during the first week or two, her responses to a simple "What's going on?" change often, and unlock new stuff in the game for you. Later in the game, there will be times when she's unreceptive - those should be pretty obvious once you get there.

Walkthrough and Guide Walkthrough: The Golden Rule Always talk to Bree whenever you run into her.
