It can be a DIY project but you may need some uncommon tools. In the case of the Equal-i-zer, a 1-7/8" thin wall socket and 320 lb torque wrench are recommended to install the ball. I didn't have a 1-7/8" socket that would fit in the trunion cavity so I had a trailer shop install my ball with an impact; they didn't have a torque wrench that large either.