Reply to "Has anyone done their own leather installation?"

Yes. Me. You need to be able to sew. A regular Singer will handle it.
The dual pod dash is really difficult to do. The single pod although not childs play is easier.
The leather can be a PITA to make stick to things like the dash.
The heavy duty headliner adhesive works but the problem is the back of the leather is "hairy" in the sense that it is torn and sometimes if it is too hairy, you need to sand it.
Also when the leather is new, it is very pliable. This helps in some places because you have to stretch the crap out of the leather since it is so pliable. Because of this and it's stretch ability it can be difficult to make it stick to the compound angles and the crevices too.
Simplest thing to do is to buy the leather kit from a vender like Wilkinson or Hall then it is basically mounting it on the panels.
I went with leather on the headliner too.
It wouldn't hurt to have an industrial or commercial pneumatic stapler also.
I've noticed a lot of Panteras with "aftermarket" interiors no doubt from local upholsters and the details vary considerably.
Personally I think they added a lot of pleats that are unnecessary but it does add to the individuality that so many of these cars exhibit.
Leather is much easier to work with then vinyl but the answer to your question is you just need to do it, then you will be an expert for sure.
The leather skins are at least $150 each and roughly the size of a 4x8 sheet of plywood.
I believe that I used 4 skins without the seats which I bought from Hall already done.
You need the room of basically a two car garage to deal with the skins and assembling them on the interior components. That's not including the two car garage you need to work on the car with the doors wide open all the time.
Oh, I found that some of the spray glues are not compatible with the upholstery foams over time and the foam will disintegrate into a messy powder.
I just had to redo my console and arm rests as a result since I had used thin foam under them originally.