They are not hard to install of youve read a good amount of threads about questions people have during installation and their solution at the end, just so you would know what to do if somethimg came up. Theres a thread on here, tj lift reviews, read some of those to get an idea of what you want and how they look and ride. I just installed a 3 inch zone lift on my jeep, one of the lesser expensive kits but has many many good reviews and I love it. Going from 3 inch to 4 inch and 4 inch to say a 6 inch is a bit of a difference, as you will need to replace more and more parts that become too short with higher lifts. My biggest advice as many on here will say is to read a bunch of threads, it really helps a lot.