That brings up question. You only mentioned Pitman arm, but does it also have a matching drop bracket? If not, you need one to keep the angles parallel.
But for now I'll assume that those are both installed and you just want to use the track bar.
Since the bar does not carry a load you do not need to jack anything up or support the vehicle. You can do it right on the vehicle in the driveway with no problem.
The biggest hassle is getting wrenches on the upper track bar bolt and nut and getting enough room to get some turns on it. I actually do like taking the driver side tire off just to give me more wiggle room and eyeball room.
If they are original then they are both on very tight. But they should be removable with handtools and some persuasion. Remove the lower nut but do not try to pull the bar off until you get the top mount off. Remove the upper bolt and drop the upper end of the bar out of the bracket. you may have to use some persuasion to pry it out.
Once it's lowered you can pull it off the lower studs and install the new one in the reverse order.
When you get the old one out you can lay it next to the new one and adjust it longer by what you estimate to be the proper amount. If you are truly 2 inches over, then adjust it 1 inch longer than original. It might not be that much though so it doesn't hurt to actually get measurements.
Once it's all installed you can verify that your axle is centered in the frame and make further adjustments as necessary at the upper end.
It is very common for the frame to shift sideways over the axle when you remove the bar. Once that happens the bar does not fit into the upper bracket and you have to manhandle it over. Some people use ratchet straps, but I use the steering system itself. With at least one tire on the ground you can turn the steering wheel slightly, which moves the body and frame over the axle. I don't remember which way is which so you'll have to experiment by turning the wheel and see which way the body moves. Obviously, with one wheel on the ground and one side up on a jackstand, be very careful when you're doing this.
Once it's over there you can line up the upper bracket again.
When doing it alone you can sometimes just reach up into the engine compartment and turn the steering shaft by hand and it will move the body.
Good luck!