This is a guideline to replicate and scale-up a human resources promising practice documented by the Capacity Project for outsourcing human resources services (HRS) to obtain a rapid increase and deployment of the health workforce, making HIV services available in a short period of time, especially in underserved areas. The guideline is based on the program implemented by the Ministry of Health and Social Services (MOHSS) of Namibia and the US Centers for Disease Control and Prevention (CDC). Human resources planners and managers will find useful information on the context in which this solution was implemented. Although context varies from country to country, the need for additional human resources to make HIV services available and system regulations that constrain quick management responses are common challenges faced by many low- and middle-income countries. The guideline also analyzes the challenges that test the validity of this innovation, warning health managers and decision-makers of the strategic and implementation pitfalls they may experience, based on the actual difficulties, pros and cons reported by stakeholders who took part in the Namibian program. The guideline also provides an analysis of the critical steps required to ensure a smooth and successful program implementation, considering the initial context, system limitations and implementation challenges.