What are your tips for dealing with a stressful project on a tight deadline?

breaking things down into manageable pieces and making sure you are only looking at the immediate needs at any given moment. "By the end of today, I need to get X done." And plan built in short cognitive breaks.

Don't rush. I know about working in a stressful environment with tight deadlines (I used to work in advertising, not anymore 🙃), believe me, you don't want to rush. Reserve 1h or 2h to sit down and develop an action plan. Every detail you can foresight is a win.