One note...NSS 806 is circular, not linear, so you will need to either (1) install a true circular feedhorn, or (2) install an LNBF with dielectric plate.
#2 requires a potentially larger antenna. I would not recommend anything less than 8 feet for acceptable reception. In some cases, 10 feet is advised.
We do have some experimenters in our little group that have had luck with a six foot antenna, but they were using a very efficient antenna and are quite skilled at alignment. This is not something you can expect an installer that is only familiar with DBS systems such as DirecTV or DISH Network to do well. It takes skill, test equipment, and patience, as well as good components.
My advice would be to start looking around the neighborhood for a used 8 to 10 foot dish that is not in regular use. The larger the antenna, the easier it is to lock in a lot of good signals.
You will need a decent view of the southeastern sky, since the satellite is at 25.9* elevation from your location. However, unless you live in a highly wooded area, this should not to be too hard to do.
As for dish size, I would recommend at least 7.5-8', and a proper international circular feedhorn, like the ADL CP-300 or CP-400. Because it is an Atlantic satellite, spaced 3* from nearby satellites, many have been able to receive it with a smaller dish and the more typical linear feed with a dielectric insert put in; you might not get all the transponders reliably this way. However, if you want to use such a feed arrangement you may get good reliability with a bigger dish, e.g. 10' or 12'.