"How difficult" is relative, depending on your mechanical ability.
The only special tool you might need is a banding tool for the metal bands that go around the CV boot, unless you buy a CV boot that comes with a special set of bands that can be done with normal hand tools that everyone has in their garage.
Basically, you jack up the machine, take off the axle nut, hub, and disconnect the carrier assembly from the A-arm, and yank or pry the axle out.
Once you have the axle out you can remove the CV boot and pop the CV off the end of the axle. The exact procedure for that step can vary so I will let someone familiar with this year/make cover that. Some have retaining rings, most you just put it in a bench vise and hit it really hard with a plastic mallet. Some machines have CVs that will only come off one end of the axle - in those cases if the boot you are replacing is on the "wrong" side, you remove both boots, take the other CV off, put both boots on the axle, pop the CV back on, pack in the grease, and tie down both boots.
Then you put it all back together.
Here are some example videos: https://www.youtube.com/results?sear...eplace+cv+boot