It won't be fun.
1. remove battery
2. remove primary cover (leftfoot peg probably needs to come off to do this)
3. remove rear exhaust pipe
4. remove (you might get away with just loosening this) the drivebelt front sprocket cover (right footpeg and front muffler might interfere)
5. remove starter wiring
6. remove starter bolts
7. remove starter
reverse procedure to install
In addition to the starter itself, you'll want to have gaskets for the following:
- rear exhaust port
- exhaust crossover tube
- primary cover set
and oil to refill the primary chain case