Half turn and pull old bulb out, install new bulb, half turn, and you're done.
I believe on the YJ's you can reach the bulbs from under/behind the dash.
TJ's you pull the cluster out and there they are.
There's a good thread on doing LED's in the TJ section.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.