G: If you don’t follow the PDLC (Product Development Life Cycle). Do not let others dictate your Product Development process. These guidelines/steps are imperial in achieving success, and every small step is important.
F: If you don’t track your Product Metrics on a regular basis. Constantly read your product feedback and take it constructively, and derive as much value as possible.
E: If you wait to define your Success Metrics post the launch. You need to have researched all the parameters and anticipate the response, and set your goals accordingly.
D: If you don’t do at least a low-fidelity wireframe yourself.You need to share a rough idea of what's expected and let them go around with their magic.
Remember, a solution that works in one scenario may or may not work in another, depending on the problem statement and how your initial research findings work out.