This document provides tips for mobile app marketers on how to avoid mistakes when launching a new app. It outlines strategies to employ the month before, week before, days before and on launch day, as well as post-launch. Key recommendations include setting success metrics, creating promotional videos, focusing distribution, drafting marketing assets in advance, engaging with press pre-launch, tapping existing users on launch day, and continuing user engagement after launch. The overall advice is to plan and prepare thoroughly, engage partners and press, and maintain communication with users throughout the launch process and beyond.