Door latch question

I got my door latches in today. I'm using the "trimark" type latch.
It did not come with a template for cutting the holes and I can't seem to find one online.
It's going to take a rather large hole and I don't want to screw it up.
Anyone that has installed such a latch is welcome to give me any pointers if they can.
Thanks!

It did not come with a template for cutting the holes and I can't seem to find one online.
It's going to take a rather large hole and I don't want to screw it up.
Anyone that has installed such a latch is welcome to give me any pointers if they can.
Thanks!