My guess is that is VERY easy, I just wanted to make sure. Here is what I am going to do:
1: Losen the chain all the way.
2: Airgun off the sproket.
3: Airgun on the new sproket.
4: Tighten the chain.

Right? Wrong?

 

That's about all it takes.
Here's a few tips;
The sprocket has a lock tab. You should be able to re-use it but I recommend bending it in a different location. Your dealer should have replacements in stock.
Pay attention to which side of the sprocket goes toward the engine. The sides of the sprocket are different.
If your going to a larger sprocket you'll have to grind on the case saver to get the chain to fit.
Make sure you adjust your chain correctly. Failure to do so will trash the chain roller.