A shower head replacement is typically an easy DIY job, depending on the type of shower head. Basic types such as fixed shower heads can be removed and replaced by twisting it counterclockwise by hand or with pliers. You may need to use a wrench to unscrew an older shower head. Clean the fixture thoroughly before attaching a new shower head. Screw in the new shower head by twisting in a clockwise direction. If you have trouble installing the fixture DIY or if you experience water leaks after the replacement, be sure to call a contractor to ensure the job is completed correctly.