i prefer to do my own, but DTV won't allow you to install the slimline dishs yourself.
DIRECTV has never said you are not allowed to install the slimline dish or any other dish for that matter. It's not like they'll send a guy over to uninstall it if you buy it and do it yourself.
I don't like waiting around all day for an installer to show up, show up late, or never at all.