You cut it in a circle that is the same size as if you had cut the ball in half. Cut it with a bit of a "neck" on it so you have something to hold on to when you are inserting it. You roll it up, stick it into the ornament (holding on to the neck), and it will unfold by itself. Because it is as big as the biggest part of the inside and because of the neck, it should "stand" upright, but I usually funnel a little sparkly fake snow on either side of the transparency which gives it something to sit in.
I hope this makes sense -- sounds like gibberish now that I read it!
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