need help fast, please

[Chevy409]

I'm a freshman at college now, only been a week and someone already cut a valvestem on my truck!!! Campus safety kinda sucks and they say they can't help me. On top of things, my work study doesn't start until tomorrow and even then i won't get paid for a couple weeks and I don't have enough money to bring the truck to a garage! Fortunately, I have a spare stem in the toolbox so later today, when my classes are over, I'm going to just take care of things myself in the parking lot. My question is: can put a valve stem in without breaking the bead and taking the tire off? Will it push through with some persuasion or do I need to pull it through from the inside of the wheel? I need the truck for transportaion to my work study tomorrow so I'm in a jam to get this done tonight. Any help is MUCH APPRECIATED. Thanks a lot.