Stage 1 is responsible for most of the difficulty rating -- use your "geosense" and the cache description to get a few hints about where to look while standing at the posted coordinates. Bringing a pair of binoculars may be very helpful for reading the serial number once you spot the recognizable Travel Bug insignia (plus it helps simulate the "star hunt" experience). Although the trackable is always in plain sight, there are some times of day and sky conditions that make it easier to spot.
In order to gain access to the final coordinates, you will need three numbers -- call them X, Y and Z. X is the only digit found in the trackable's ID, Y is that digit's position (1-6) among the 6 ID characters and Z is the diameter (in meters) of the Green Bank Telescope. The final coordinates are N 39 39.nnn W 79 59.www, where nnn is given by (Z-41)*X and www is given by (2Z-7)*Y.
The final location is in another astronomy-related part of town and is not shielded from passerby, so use some stealth. The container itself is big enough to hold small trinkets, geocoins and perhaps a small travel bug or two. I would encourage kids (or adults) to name the stars they find. There is a Signal the Frog geocoin for the FTF!
Don't forget to take a picture to "record your data!"
Congratulations to Aquacache on the FTF!
9/9/2014: Multiple mechanical issues with the final hide have led me to replace the small container with a micro, which unfortunately does not hold more than a log. I think the original difficulty rating was slightly too high when I first hid this cache though, so with the new container, it's probably just about right now. Good luck!