I ride in a rural area as well with cars going 60+. I was scared at first but it's the only place to ride. I can only ride a ten mile round trip as it's one straight five mile hill but riding down it at 30mph is a huge rush.

The only thing that is hard is the semi trucks blowing past you so fast. Oh..and the combine tractors that ride the shoulder. Eek. Thankfully that was only once and he moved over to pass me.

I agree with being highly visible and being aware of your surroundings. I also look for places that are "crash" worthy if I need to bail out from a crazed car.

I always carry a cell phone.

Congrats on conquering the road.