Its easy as pie. And you get a new drive side bearing race! Yes!
I'm pretty fair, and I can admit when something really is better. I've worked with enough freewheel hubs, and seen enough crusty, clunky freewheels and bent axles, and cassette hubs have finally won me over.
If you tend to strongly disagree, and you have the resources, try this before you argue
:
1. Take a cassette hubbed wheel in great shape
2. Put on a 9 speed SRAM cassette
3. Get an 80s bike with a shimano light action (or similar) 6 speed indexing drive train (earlier bikes with friction shifting will work, but I know the light action rd has enough range for a 9 speed cassette)
4. Set the rear dt shifter on friction
5. Install a 9 speed SRAM chain
6. Install wheel
7. Adjust hi and low on rd to reach all the gears.
8. Feel how it shifts
Things that have gotten better:
-Chains
-Cassettes
-hubs