In Hitman:Absolution, I am currently playing the mission Part 1: Terminus. I am playing in Normal mode. AFAIK Normal mode does not regenerate Instinct. I have to rely on other sources for that. In my campaign I am real low on Instinct. How can I boost it, to get past guards and to Room 899?
A usual and practical way to restore Instinct is by finding a nearby NPC to kill/knockout silently and then hiding their bodies in a container. Check if there's a container nearby where you can safely hide a body before going in for the kill/knockout. Make sure the kill/knockout is silent.
You can also gain Instinct by "hiding". This can be done by pressing the "hide" button when a prompt comes up near an object where you can hide.
To prevent Instinct from going down, avoid being noticed by NPCs wearing the same clothes as your disguise. Sneak/crouch whenever possible when around these NPCs; this will lessen the need for instinct mode.