dabac

I guess that would depend on what skillset you bring to the table. I have some experience of leatherwork, so I have some grasp of how much it can be coaxed to stretch, where it needs to stretch and where it doesn't. Given that I pulled it off at my first attempt w/o any cussing. Then again, with a whole scrapped leather jacket as material source I could easily have tried again if I'd gotten it wrong.

Do note that some think that the cover needs to be glued down over the whole surface.
I don't think so, but if you want to try the tip is to use contact cement and to get a good shine of water onto the saddle before placing the cover. The water will prevent the cement from latching on immediately, you can slide the cover around a bit and the cement won't engage until you basically press the water out - pretty much like when you tint car windows or apply stickers/decals the professional way.