I have applied Zymol state Wax by hand.... It does take forever but if you want to try it...
Take a VERY small amount of wax with the tips of your fingers
Put the wax in the palm of your hand and rub your hands together until the wax melts
Spread the wax with the palms of your hands (I like front to back, in straight lines)
Keep on going over the areas to spread evenly, a "smear" of wax should give you enough for 1/2 of a door panel
Finish one panel and wait the appropiate amount of time (Zymol requires just a few minutes, just enough so the wax gets tacky)
Remove with 100% cotton or Thick MF
Move on to the next panel
Once you are done with the whole car, smoke a big Cigar (trust me you need the rest)
Buff lightly with towel of MF
I do not think durability or shine are affecrted in any negative way due to body oils, but I do apply it over Klasse SG, so your millage might vary.
The best advantage is that you can feel all the rough spots and any dirt you missed in the wash.
Is it worth it?... Nah!
:bounce