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If you are shooting the film yourself you will need to rent a studio and set it up. By now you should know how many days of studio time you need because your storyboard has that mapped out. You should also know what equipment you need. Shooting a film is a big project. You are fighting for airtime so you want your PSA to look great. It will take the collaboration of a team of people to make that happen. Schedule tasks ahead of time so there is no confusion when you get to the studio and start shooting. If you are hiring a professional production company they will do this for you. Spend one day going through the shot list with your cast and rehearsing the dialogue. Make sure they memorize their lines and the crew knows where they should be. This way the production process will go by smoother with less necessary editing. This is a good time to test your lights. Lighting is important to the visual quality of a film. You can take this opportunity to make sure the lighting looks exactly how you want it to look. When you get to the studio the next day it will already be in place. Go through your scenes again, filming this time. Make sure you film each shot several times, from different angles. Be a perfectionist. This is an important project that needs to look exactly as you envision it. Whether it is your studio or a rented space, you should clean up after yourself. Return any rented equipment, replace anything you moved, and clean anything you made dirty. As you now know, shooting a film is cumbersome. Cleaning up after the person before you is the last thing you want to deal with.
Organize your studio. Delegate tasks. Rehearse your scenes. Shoot your film. Clean up the studio.