Coming September 22, 2026

The 90-Day Leadership
Field Manual

Practical Guidance for First-Time Leaders

You were promoted into leadership with almost no guidance. This is the practical, day-by-day field manual that walks beside you through the first 90 days — so you can build your confidence and your team’s trust without learning everything the hard way.

By Haraya Del Rosario Gust

Be the first to know when it launches

No spam. Just launch updates and early access.

The 90-Day Leadership Field Manual book cover

The Problem

Most new leaders are left to figure it out alone.

Every year, millions of people are promoted into leadership roles with a title, a handshake, and an assumption that they’ll figure it out. Most do — eventually. But the cost of that learning curve is significant: disengaged teams, preventable turnover, and leaders who burn out before they find their footing.

82%
of managers enter leadership with no formal training
60%
of first-time managers never receive transition support
$366B
spent annually on leadership development — most bypassing those who need it most

Sources: CMI “Better Managed Britain” report (2023), YouGov survey of 4,500+ workers and managers; DDI Global Leadership Forecast; Training Industry, Inc. global market data.

A Complete Onboarding System

Not just a book. A system.

The 90-Day Leadership Field Manual is the foundation of a structured onboarding ecosystem designed to support the new leader, their boss, and your organization.

Now Recruiting · Limited to 15

Founding Cohort: Shape the Field Ready Program

I’m inviting 10–15 HR and L&D leaders to join a Founding Cohort — an 8-week facilitated experience that prepares you to bring structured 90-day new-leader onboarding to your organization.

Pre-publication access to the complete 90-day framework
8 weekly live sessions with the author
A peer cohort of HR/L&D leaders implementing the same system
10 copies of the published book upon release
Certified Field Ready Program Facilitator status when the program formally launches in 2027
Direct input into the program curriculum design

The Founding Cohort runs October 6–November 24, 2026 (weekly). Designed for HR/L&D professionals, executive coaches, corporate trainers, and senior people leaders.

Send a LinkedIn message or email haraya [at] teamsatori [dot] asia with the subject “Founding Cohort Interest.”

An EOS Implementer®?

Your clients keep promoting people into their first leadership role, and those first 90 days are a lot to take on. The Field Ready Program supports a brand-new leader through them — a practical, day-by-day on-ramp to How to Be a Great Boss. You don’t deliver it; you simply introduce it, and your client’s HR or L&D lead becomes the certified facilitator. It’s a way to meet a need your clients keep raising — without adding anything to your own plate.

Learn how to refer ›

Endorsement

“The guide I wish existed when I started.”

Gino Wickman

Author of How to Be a Great Boss, Traction and Creator of EOS®

About the Author

Haraya Del Rosario Gust

Haraya Del Rosario Gust

Serial entrepreneur, Expert EOS Implementer®, and author. Haraya has spent more than 20 years working with leadership teams across the US, UK, Australia, Singapore, and the Philippines. She co-founded StraightArrow (acquired by 2X in 2023), serves as Master Franchisee for EOS Worldwide in the Philippines, and trains entrepreneurs as an EO Forum and Accelerator Trainer.

She wrote this book because she kept seeing the same gap: talented people promoted into leadership and left to figure it out alone.

Connect on LinkedIn →