Are these replaceable by the typical doityourselfer?

Go to autozone.com/repairinfo and see if you think you can do this.

Other than a few special tools required (torx bit socket for hub to spindle bolts, axle nut socket for the big nut on the end of the CV axle, and a torque wrench to tighten everything properly), if you can do brakes, you can do a hub bearing on that car. BCA/timken number is 513044, just for reference.

60mm heavy duty Torx, and 36mm axle socket, just to add to Rich's info.