The 2002 GMC Yukon XL 2500 SLT is a moderately easy vehicle to maintain, but is more recommended to those capable of vehicle maintenance. You will have to lower the tire from under the vehicle for access to it. The lowering mechanism can grow rusted to the vehicle and be difficult to turn. Changing the cabin air filter with reliability will require many tools in order to complete problematic steps. Other models will make this filter easier to access. You will have to completely remove the tail light housing for access to the reverse light.
Some things are easier on the 2002 GMC Yukon XL 2500 SLT. Checking the transmission fluid level is easy to do, as the dipstick is easily accessible in the engine bay. Not every model includes this dipstick. The engine coolant reservoir is easily visible in the engine bay. This will allow you to check and replenish the fluid level on a regular basis. Changing the fog light is easy to do, as you only have to reach behind the housing for access to the assembly.
Hans Angermeier has produced over 100,000 videos showing drivers how to fix things on their cars. He has broad expertise on basic repair procedures covering the majority of cars on the road.