This document outlines the key lessons learned from the speaker's service design journey over many years. The five main points are: 1) Service design requires balancing the experiences of customers, staff, and the business. 2) Service design problems often have no single right solution, so ambiguity is normal. 3) Storytelling is a key tool in service design to illustrate experiences. 4) Great ideas are not enough - successful service design requires executing and sustaining ideas over time. 5) Service design requires bringing together diverse stakeholders like customers, designers, and the business to work as a team.