Can I easily replace my Direct TV satellite dish with a new one?

I have a dual LNB Direct TV satellite dish, and I also pay extra for HD channels. Yet I did not replace the dish with a new one, and I only recieve about 8 HD channels. I am thinking about buying one online for around $30-50 and installing it myself. I was wondering if I was able to simply switch out the dish, or if I had to call up Direct TV and have them install it.|||If you feel comfortable with it there's no reason you can't install the dish. Use the tone and bar offered from the satellite menu to peak the dish for best performance. If you don't feel comfortable call a local dish installer that deals with Direct TV.