Not addressed to the student.
Run the Hazard Clip first, cold. Before the aerodynamics, before any reassurance. The clip does work a warning cannot, and it does it best without a preamble. Then go to the centre of gravity and let the student connect them. Explaining the mechanism first turns the clip into an illustration of a point already made, and most of the effect is lost.
Do not minimize and do not dramatize. The line that has worked: this is a demanding airplane flown safely by ordinary pilots every day, and the reason it is demanding is one fact about where the wheels are.
Budget more taxi time than feels reasonable. The temptation in Lesson 1 is to get airborne, because the student is a certificated pilot and taxiing can feel like an insult. It is not. The directional control habit is the whole course and it is cheapest to build on the ground. If the flight runs long on taxi and short on airwork, that is the correct trade.
Weight and balance is a live calculation, not a ground topic. Do it with the student, with real numbers, before the flight. A student who has personally computed that they and you and full fuel do not fit has learned something no briefing conveys.
Watch for the competent-pilot problem. Phase 1 students are frequently experienced and frequently quiet, because they are used to being good at this and are not, today, entirely good at it. Silence in the airwork is usually embarrassment rather than comprehension. Ask.
Brief transfer of control before the walk to the airplane, not at it. It is used heavily today and it needs to be automatic before it is needed.
Do not demonstrate a wheel landing today. Lesson 1 closes with a demonstrated three-point landing. Wheel landings are demonstrated in Lesson 2 and flown to standard in Lesson 3. Showing one now, before the student has seen a three-point at all, invites them to blend the two techniques, which is the specific failure Phase 2 exists to prevent.