I have a Polaris 500 Sportsman Big Boss that needs a new chain and maybe sprockets.

Question I have is: when you replace a chain, is it generally required to replace the sprockets as well?

As a layman, the sprockets don't look that worn at all.

Also, how challenging of a job is it to replace both?

For those that aren't familiar with the Big Boss 500, it is the 6-wheeler Polaris built so I'm looking at 2 different chains and 3 or 4 sprockets.

JMHO, if I was going to hang on to it for awhile I would do chains and gears. First I would find a repair manual, though to save myself some grief. Good luck to ya.