I don't mean to be glib or sarcastic, but when I bought my new rear brakes at a chain auto-parts store, for a few dollars I got a Rear Drum Brake Kit made specifically for my '93 Cherokee Country. With the kit are picture directions that can explain better than just seeing it in text. You will also want a brake spring remover (nominal cost, ask the clerk) and a needle-nose pliers. Good luck!
A 2000 Jeep Cherokee would have rear drum brakes.
The grand Cherokee does have four wheel disc brakes. The wrangler and Cherokee have rear drum brakes.
Drums
You have to measure the inside diameter of the drum.
A 1998 Jeep Cherokee has disc brakes in the front.
First, determine if they are disc or drum. If drum, remove the drum and replace the shoes. If they are disc, remove the caliper (and disc if necessary) replace the shoes and reassemble.
Most likely disc Most likely disc
There are disc brakes front and back on the Cherokee. EDIT: Cherokees (XJ) have Drum Brakes in the back. Disc in the front i don't know if you were referring to the new Grand Cherokees .. Those have All Disc. Hope it helps. (i own a 88 Cherokee XJ)
It was an option
NoNo
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Since your question is too much to the point, then maybe you only want to know if it is possible to replace the brakes? Yes. And next time, be a LITTLE bit more specific.