The "your files don't leave your machine" point is worth emphasizing more than most guides do. That changes the risk calculation for what you're willing to let the agent touch. The step-by-step format here is solid for people genuinely starting from zero - the desktop app path is easier than the terminal path and most intro content jumps straight to terminal.

One thing I'd add for after the first task completes: set up Git before you do anything else. The moment the agent starts making file changes across a session you want the rollback option immediately. Not urgent until the first time it's urgent, and then it's very urgent.