A CB and antenna are quite easy to install, about the hardest part is figuring out where to mount everything. I highly recommend the Cobra 75 radio, it has a small box you mount behind the dash or under your center console then you plug the handset into a small plug you can mount about anywhere. As for the antenna, many manufactures make some form of bracket that will provide a bolt on solution for mounting the antenna. From there all you need to do is run a power and ground wire, of which I suggest that you find a constant hot so that you don't have to have the key on to use it, and run the antenna coax back to your antenna.
Once you have everything installed and working, you can go a step further and tune your antenna, but at the ranges we typically use the radio's you can definitely get by without having it tuned.