Easy as pie.
Like other said, you will need to find the hubs which thankfully are assemblies. So you wont need to press fit them on and off.
Find any 97+900 or 9-3. remove the brake Bull ish to make them lighter, and just undo the 4 bolts where they meet the axle. Unplug, and tap them out.
Just remember you will need to cut your dust shield too. Dip, has a great write up, so does PhilipHS. And both Bullseye and myself have a small thread on the subject.
To find out if you have the smaller hubs, find a used 9-5 or later 900/9-3 used brake rotor and see if it fits on.