It is possible to install a water heater yourself, but it is not recommended in most cases. Water heater installation can be a complex process that involves electrical and plumbing work, which requires experience and expertise. Improper installation can lead to serious safety hazards such as gas leaks, fire damage, and even explosions. Therefore, it is best to leave water heater installation to the professionals who have the necessary knowledge and certifications to ensure that the job is done safely and efficiently.