I am not so sure you have the room to get it off the flange and pulled down. Then you are working on it under the car? Or do you have access to a lift? To get the parts apart seemed to be a pain to me and normally I had joint problems not just a torn boot. Don't they make a replacement boot that you slide around the joint then seal with a melting compound?
personally i usually just replace the entire axle when there is a torn boot, it costs only slightly more and saves you a bit of time.