Measuring is crucial before renter-friendly DIY projects to ensure proper fit and avoid costly mistakes. Experts recommend measuring twice, especially for furniture and rugs. For example, a living room with a sofa at least seventy-two inches long balances well with an eight-by-ten rug. Accurate measurements prevent returns, redoing work, and damage to rental surfaces. Start by mapping room dimensions on a floor planner and physically measuring spaces before purchasing items or applying wall treatments.