What nonclinical prep and mindset shifts are essential before first deployment?

[William_H]

I'm preparing for a deployment with a medical NGO to a protracted conflict zone, and while I have clinical experience, I lack practical field experience in such a high-risk, low-resource environment. The security and logistical challenges are my primary concern. For experienced humanitarian aid workers, what are the most crucial, non-clinical preparations and mindset shifts you wish you'd known before your first deployment, particularly regarding negotiating access, local partnership dynamics, and maintaining team morale under constant stress?