Broken Key in the ignition Help!

[threeonthetree]

I was up north a couple weekends ago and had a bit to much of the sauce i believe and was gonna fire up my old rusty k5. i proceeded to turn the key but it didn't turn i looked at it and half the key was gone. its in the ignition i'm wondering what i have to do. can i get the other half out and get a new key made or should i get a new key and tumbler and how hard is this swap.

thanks guys!