you can but it's a risky job.. Anything that involves installing airbags is something you wouldn't want to do yourself. Just my .02
Can i get un-deployed air bags from another decked runner and swap them into mine?
The guys I work with do it all the time. The BIGGEST thing it to make sure you unhook the battery. Static electricity can also set it off so be very careful.
I would say if you've never done one to have someone that has do it to be safe.
Like Rc4r said bring it to a body shop and have them install it. Wouldn't think they"d charge all that much.