Good for you Spaceoddity, that's the spirit!
I actually do have a couple of suggestions for new solo TS diners. First suggestion, go for lunch. TS lunches are always a bit less formal, on the less crowded side and diners are still in the midst of their busy day in the parks.
Second suggestion, go somewhere that you really enjoy for the familiarity and comfort level. You love Le Cellier? Great! That is a very good choice for solo meals. Another suggestion would be Chefs de France on the patio. It has a more casual, fun feel and there is plenty going on outside at EPCOT to keep your focus on rather than on your solo status.
You'll have a wonderful time at the F&G show too!
Just give a holler if you get a bit scared, we'll be here for you!