Not as bad as you’d think. Back when, I rode in a (admittedly much lighter) tracked vehicle, the M113 APC, and trackwork was the order of the day. Although the job is heavy, dirty and unpleasant even by infantry standards, it takes no special facilities or extra personnel. The tools are on the vehicle, and the driver/co-driver team with a little strong-back assistance from the rest of the squad can replace both tracks in a couple of hours, as long as there’s a paved surface to work on.
The trick is to temporarily open the old track, connect it to the new track laid out in front, then gas up and basically back the vehicle, pulling the new track in to replace the old one. Disconnect the old track, pull the ends of the new track together (tools on the vehicle), hammer the pin through to loop off the new track and adjust the tension wheel. Presto. (Much preferable to the more common situation where you’ve somehow driven off the track and everything is crunched up, under the vehicle, in the slush. At night. While it rains. But I digress…)
Sure, tanks are about 5-6 times as heavy and you’ll probably want a truck with a light crane to handle their tracks - but basically, the job involves shifting about the tracks, not so much the vehicle.