How hard is it to install a turbo?

A turbocharger isn't something you just slap in like an air filter. It must be engineered to fit and work with your engine. If you have to ask on this forum, then you don't have the knowledge or the skills to do this modification.

In order to put a turbo on a car you need to look at where is it going to fit in, you'll need to get a new manifold and exhaust to be able to bolt it on, plus a new intake to hook it up to. Next you need to look at the motor your going to put it on will it take the extra pressure from the turbo? With enough time and money you can do it.

probably too difficult for you, if you need to ask this question