the installer will provide all cabling for remote tvs and in most cases run them inside your walls and install wall plates if he has access to your attic or basement and your walls are hollow. for TV one you will have to provide your high def cables like composites or HDMI , tv 2 will be hooked up with standard RG6 or RG11. most of the time , the installers are nice enough to install the OTA if the cabling is readily accesyble and doesnt take them too much time but its completely up to the individual installer.
imho the biggest concern will be where the dishes will be installed. during the last install in my house, installer screwed dishes to an awning that had rotting wood so i had to reposition the dishes myself, kinda defeats paying for installation. make sure to point out good structural points on your houst for the dishes to be set and dont sign the yellow completition sheet unless you are absolutely satisfied with all aspects of the install, if you have doubts , call dish network customer care prior to signing while the installer is there , once you sign, you basically cant conplain about the install anymore.