Honestly? I thought it was pretty hard. Well, the front was hard. But, this is the first front-end suspension I've ever done.
You'll be MUCH better off if you have a lift to put the truck on. And plan on it taking an entire day. The front took 80% of the day, and the back was a breeze.
Oh, and another tip, before you install your rear shocks (buy aftermarket shocks, btw), look at them and make sure you install them with the end down that says "this end down". I recently figured out that I had installed both rear shocks upside-down. They weren't damaged, but I heard that they can easily get damaged if they're upside-down.
Make sure you check out the PDF copy of the DJM instruction sheet in the tech area and check out photos I took while I was installing my kit.