Decide your price for your values now: not for sale. Deciding later is how people get talked into things.

Decisions made under pressure are made by whoever is applying the pressure. If a line has not been drawn in advance, the moment supplies reasons, and those reasons will sound excellent right up until afterward. Settling the matter in a calm hour is what makes it hold in a loud one.

Name two or three things you will not do, in plain words, before anyone asks you to. Say them out loud to someone so they exist outside your head. When the pressure comes, you are then only remembering a decision rather than making one.