Changing heating elements on electric water heater

In 80% of the heaters it is an easy job. Teh other 20% have elements that were installed with an impact wrench or have leaked and rusted themselves onto the heater. These can be repaired but the labor costs usually indicate a new heater is less expensive in the long run.: Im running out of hot water after about 5-10 minutes.I have a 50 gal. electric water heater. Im thinking about changing the heating elements.Is this an easy job?

In 80% of the heaters it is an easy job. Teh other 20% have elements that were installed with an impact wrench or have leaked and rusted themselves onto the heater. These can be repaired but the labor costs usually indicate a new heater is less expensive in the long run.: Im running out of hot water after about 5-10 minutes.I have a 50 gal. electric water heater. Im thinking about changing the heating elements.Is this an easy job?