I did this rebuild a year ago on my "72 Satellite Sebring Plus. In my case, four items were tricky.
a) there was no instruction sheet so I had no idea what diameter hole was needed for the pin bushings. Based on my measurements, I found it necessary to special order a drill bit at ACE hardware. The drill bit was specified by a number and not by a fraction (i.e. #50 vs 3/8) but I don't remember what the number/size was. You need a press fit.
b) the portion of the lower hinge that holds that little dogleg piece for the spring had spread open/apart on both doors. I had to sqeeze that portion of the hinge more closed after things were all taken apart to return it to its original size opening. Actually I forgot to do this on the driver's door and now that dogleg that holds the spring rides up too high (won't stay centered on the roller) but so far the door on that side still opens and closes OK.
c) Since the stock hinges are made without bushings, I had to clearance one portion of the hinge by grinding so the shoulder of the bushing would clear. This may weaken the hinge a little but no big deal. You also will have to decide whether to insert the bushing from the top or bottom.
d) getting the spring in place while putting the hinge together was a little tricky, needed a big vice and a buddy with another pair of hands. It is entirely possible to make a mistake and reassemble something backwards/upside down (just ask me how)
Of course, if you have step by step written instructions, by all means follow those and disregard everything I just said. If you do have instructions, please, please send me a copy! You might want to do only one side at a time so you have a correct reference.
