For my 1.9 L I had similar problems finding or understanding the process.
One source of information I used was on a Porsche web site
(http://www.pelicanparts.com/techarticles/914_valve_adjust/914_valve_adjust.
htm) which talked me through the process.  In fact, once I popped the
covers, the process was pretty accurate.  Here's how I found TDC on each
plug, based on a suggestion from a listee:  Remove the respective plug, pur
a pencil or small wood dowl in the cylinder resting on the piston.  Move
the piston until the pencil/dowl is optimally out.  With the transmission
in neutral, I moved the fan belts to move the cylinder.