jerry, my son and I run a 60" TT and a 52" V-Ride and take care of about 25 yards as a side business.
We try to freshen the blades about every 20-30 hours. Time spent putting on fresh blades is never wasted.
What I do is use a pair of the cheapo ramps. However, they won't give you enough clearance unless you put a 4" cinder block under them.
Mackie has a nice mower lift. I really covet one of those.
I place the cinder blocks under the front of the ramps and pull the front wheels of the mower up on the ramps and set the parking brake. Like Mackie, I use an air wrench to loosen the bolts from the top and let them drop out the bottom. Assemble in reverse order. Like Mackie said, for the 72" deck, you may need a helper to start the tap on the bolts.
Unlike Mackie, I apply anti-seize compound about every third time. It makes a world of difference when you attempt to remove them next time. Also unlike Mackie, I don't worry about torqueing the bolts. The first time you mow over some thick grass, they are going to auto-torque to 100+ foot-pounds anyway.
I can't imagine regularly doing this job without access to a good air wrench. However I have heard some good things about the electric impact wrenches. That might be an option for you.
Good luck if you attempt to do your own sharpening or blade changing. I know it would save you a lot of money.
P.S. I need to add that Mackie knows about 10 times more than I do about Scag lawn mowers.