The actual installation of a cast iron tub will be no more difficult than a regular model. It may simply be a case of replacing it with the old model, but if you want to change the drain or faucet position, then this will take extra work. The biggest consideration for many people is the tub's weight, as most of them are way over 300lbs with some much higher than that. You'll have to plan how to get that into place before you buy the tub. With most of these models, the feet are adjustable to allow you to have a very stable base.