Acer A1 S100 Service Manual - Disassemble Procedure
Acer A1 S100 Service Manual [PDF] - Disassemble Procedure
I searched the web for days looking for a tut or a service manual and finally found the full service manual with the complete disassemble procedure - including pics.
I tore mine down without this manual, wasn't too difficult but proceed very slowly because the double sided adhesives they use stick quite well and it's easy to damage the FPC flex cables if you're not careful, especially at the bottom of the phone below PCB. Make sure you have the correct tools for prying (plastic or Mylar).
Hope this helps...