Slowly walk yourself into a handstand with your chest facing the wall. Your goal is not to get your body against the wall, but rather to press your head forward to open your shoulders. The object is to stack your hips and shoulders directly over your hands.
Once up focus on maintaining a tight midline and glute. Point your toes and squeeze your heals together. Make sure your arms are locked out and actively push your hands into the ground. Always save enough energy to walk out of the hold safely.