Arduino Xbee problem


I would like to do a drive a relay wirelessly. with 2 Arduino leonardos and 2 xbees. I have no shields and adapters...

Can those communicate to each other without xbee shields and adapters but only with 1xbee connected to arduino on one side and 1 arduino and 1 xbee on the other.

Would that be possible, if how im more of a amateur?