Ensure you have a working espresso machine and coffee grinder, preferably at least 250 grams of your usual coffee beans, a milk pitcher, a suitable tamper, cleaning cloths, espresso or cappuccino cups, approximately two square meters of clear workspace, a power outlet, and a sink with running water. For frothing milk, at least one liter of chilled milk is required; with multiple participants, more milk is advisable. Geert-Jan will bring a bag of Aficionado coffee, a precision scale, a shot glass, various barista tools, cleaning agents, and a laptop with theoretical explanations.