New challenge in the office

It wasn't a promotion or anything....it's like a try outs... "acting only maaa..." i mentioned to few of my friends when they congratulate me of being "appointed" as "Acting Manager". Heck, it is nothing much except for an extra few bucks and a whole load of responsibility and expectation. Not that I'm not glad or anything, but, there's a lot at stake here, and i don't want to face the big humiliation if everything does not turn out to be what it should be, as what is currently in everybody's mind - road to success. "Helloooooo, it's just temporary. I may go back and live normally as I was before when the term is over, so i don't think all this "belanja makan" is neccessary nor is appropreate" i am trying helplessly to reason with them. I'm starting to get cold feet "can I really do this, huh?"