Nah, just go in knowing exactly what you want and tell them before they even get the chance to ask you.
"Hi, Welcome to Subway!"
"Hi, I'd like a foot-long wheat subway club toasted with pepperjack cheese"
then just tell em the toppings.
No stress on you at all. Each and every customer is doing the same thing.
The thing about Subway that pisses me off is when I walk in and there's only 1 or 2 people in line and I'm thinkin "Great - nobody here" and then the person in front of me whips out a long list and says the dreaded "Yes, I'm ordering 6 subs. The first is... no wait it has... oh that one has... she only want's this.. I'm not sure if they want it toasted..."
So if you go to Subway and order for your whole office, then you better be stressed cuz the people behind you wanna kick your ass!