Education researchers have explored the marketisation of schools resulting from neoliberal education policy, but little attention has been paid to supplementary education markets. Supplementary education services, such as private tuition, are delivered outside of school but designed to improve performance within it. A small body of research demonstrates that the private tuition market in the UK and the USA is burgeoning, and that students' access to this service is differentiated by region, class and ethnicity. These emerging demand-side analyses are vital, but they cannot tell us about the educational entrepreneurship that shapes the supply of private tutoring services. This article addresses this lacuna through a discourse analysis of manuals, published as part of the developing tutoring support industry, that are designed to guide would-be entrepreneurs through the establishment of a private tuition business. This analysis excavates manuals' treatment of: tutors' motivation to work in the sector and their competence to do so; strategies to be employed in the marketisation of tuition services; and the need to build trust to ensure business legitimation in an unregulated industry. In conclusion, the article sets a new agenda for research into fast-developing supplementary education markets that explores: (i) the dynamics of this expanding educational workforce of private tutors; (ii) the ways marketisation addresses and augments parental anxiety about children's education; and (iii) the need for safeguarding and quality control in private tuition.