If you have to ask you probably do not have the tools and experience required for the job.
Raise the Jeep on jack stands, remove the tires, brake lines, drive shaft, shock absorber lower nuts, and u-bolts. Remove the axle.
Replace the bulbs
The 1994 Jeep Grand Cherokee takes 20" replacement windshield wiper blades on both sides front and a 10" or 11" wiper on the rear.
5.1/4" in the front door and 6.5" in the rear headliner
The 2014 Jeep Cherokee has 49.9 in. of rear hip room.
The 2014 Jeep Cherokee has 40.3 in. of rear leg room.
The 2001 Jeep Cherokee has 38 in. of rear head room.
The 2001 Jeep Cherokee has 35 in. of rear leg room.
The 2014 Jeep Cherokee has 55.1 in. of rear shoulder room.
The 2001 Jeep Cherokee has 44.3 in. of rear hip room.
The 2001 Jeep Cherokee has 54.1 in. of rear shoulder room.
The 2014 Jeep Cherokee has 38.5 in. of rear head room.
The rear track of the 2014 Jeep Cherokee is 5 ft. 1.9 in. (61.9 in.).