Hi Bruce, take the headlining out first and pull it through the back of the hatch be careful its fragile, there are two templates inside and out, the best way to cut it out is by using a nibbler. failing that a jigsaw with a metal cutting blade. every straight line cut i made front/back and sides i stuck some 2" masking tape over the cuts (2 or 3 layers inside and out) to help stop the thin roof from bending and vibrating, cut the roof out first then put the headlining backin, draw round the hole you've just cut out to get the position to cut the inside, add the extended pieces which you need to cut out for the inner frame, cut it out, if you can cut it in the car by using a jigsaw or stanley knife i think that would be best, i took the headlining out again did a lovely job, but when i put it back in the sides collapsed but lucky enough the trim covers it,
Pete