Oil Pan work greatly varies depending on vehicle. I've seen some that require you to lift the motor off of the frame, whereas others are only slightly more work intensive than an oil change. Without crawling underneath, it's hard to say where in the spectrum the Tahoe would be.
Yeah, I read the manual for replacing the oil pan on my Bronco... step 1: Remove the radiator. Step 2: Remove the intake manifold (all to make room for jacking the engine up). Yeah, no thanks. I ended up paying $1500 to have it replaced.