this is very simple...
and don't "snug" then tighten, tighten ALL THE WAY or the alingment isn't right and it doesn't load the seals properly (LEAKS!!)
Slide targa in, pushing it back and then drop the front down. Tighten the two back ones, and then tighten the DRIVER'S SIDE then the PASSENGER SIDE. This is VERY important! Tightening out of sequence will cause leaks, but even worse is it can STRIP the threads in the targa. The driver's side is fixed, and the passenger side has a slider to allow for some play in the entire assembly. It HAS to be tightened last or the others won't line up right and it will strip.