Its certainly doable on the driveway...you will need extensions on the ratchet to reach the 2 bolts holding the cat to the exhaust manifold and probably an extension bar on the ratchet itself to give you enough power to turn the bolts...you will also need an extended socket, meant to be 16mm unless some muppet has changed them in the past...handily this is the same as the smaller spark plug socket

The cat to exhaust end is usually a pain due to rusting...lots of plusgas for a few days before might help...you will most likely need new bolts for this end and probably a washer and nut on each as the non GM cats often dont have the thread to screw the bolt in to...
How long it takes usually just depends on how rusted on it all is lol
Dont tighten up any of the bolts too much until you have it all back on and aligned as much as poss...