Getting the spindle off will probably be the most difficult part. If it has been on there a long time rust tends to build up and make it feel as though it is locked on. After you get the 6 bolts off that hold the spindle on i would recommend spraying it down with something like PB Blaster. Then you may need to use a little persuation to get it off (read: use hammer to loosen, but beware of threads and bearing surfaces
)
Also you need a spindle nut wrench to take the hub off the spindle.
1973 K20 - 350/350/205