When you bring home a new succulent, first check the plant, roots, pot, and growing medium. Some plants arrive in soil that stays wet too long for your environment.
Repotting gives you a chance to remove unsuitable medium, inspect root health, and choose a pot with drainage. After repotting, give the plant time to settle before watering heavily.
The best timing and method depend on season and plant condition. If the plant is already stressed, handle it gently and avoid doing too much at once.