Of all the headliners I have done, FE/FCs are the hardest (to say the least) FB/EKs are much nicer with glued down edges and stainless trim strip.
Anyway, if you are happy with front and rear attachments you can start.
Get a plastic putty knife from Bunnings and sand the sharp edges off and get a mallet or small hammer and tape some non-marking soft cloth to the face of it. No glue should be required.
1. Make sure the "alligator rail's" prongs are all straightened out, ie at 90 degrees, double check because you don't want to be stopping half-way to sort out a couple you missed.
2. Loosely push the headliner overhang up into the gap and close up the metal strip to leave a 5mm gap.
3. Set the windlace with the round section to one side of the 5mm gap with the "tail" of the windlace covering the gap, push this in with the putty knife.
4. Using the hammer or mallet lightly tap the "alligator strip" down until the gap is closed and the headliner and windlace are held, continue doing a small section at a time.
I have found that it is best not to try to hammer the entire strip down as it tends to stretch and you end up with bulges. About 10cm tight to 10cm just closed up seems to do the trick.
Happy to hear of any better (easier) methods