I used to be intimidated, but then I started cooking whole chickens once a month or so all year. The key to a moist turkey is brining it. This next year, try brining a whole chicken once a month. And around Thanksgiving, go to Williams-Sonoma or a similar store and buy a turkey brine -- they usually have one that has salt and spices. This year I got their "apples and spices" one and brined the turkey in ice water and apple cider. It was perfect!
Also, doing a whole chicken regularly gets you in practice for carving a turkey as it's pretty similar. So you can not only have a bird that's tasty, but one that is carved easily and the pieces end up being attractive on the plate. The past two years, my turkeys have been brined and have turned out deliciously moist. And yes, use a meat thermometer to tell when it's done.
-Dorothy (LadyZolt)