you buy one, they're cheap.
Or you can get by, drilling a hole through a peice of wood thats the cartridge can slip through but the rim cant, secure with rubber band and smack against a workbench edge. Works just like an inertia puller.
Then go buy a bullet puller after, you shouldn't be reloading without one IMHO. When you don't have a puller the temptation to shoot a questionable load might be a little strong