I have not replaced this duct/boot on my car yet. It should not be difficult to do, ignoring the physical constraints that rule your life. Assuming you could reach in and work the hose clamps, it is not a difficult job. Having said that, I know all about back pain and being sore at the end of doing pretty much anything.

The technical part of the job is not difficult, but reaching it can be. One problem is that the engine builder does his job on an engine stand so he/she can reach everything from a different angle than you and I get to use.