I used to cut it out with about 1/4" of extra fabric outside the pattern lines (you can always trim if you want later, you can't add it back.). If I was using a cereal box cardboard (or you can use freezer paper according to how often you want to cut it out) pattern, I'd try to iron the extra over the edge of the pattern so it would be easier to apply.
If it was an inside curve, I'd clip every so often so it would turn easily.
I haven't done any for 20 years so there are probably easier and better ways to do this now like there are for everything else(I love progress). The internet wasn't around when I was learning so it was pretty much a trial and error thing.
Have you looked at Youtube, there you can actually SEE how it's done, I love youtube. There's a batch of tutes on it.
http://www.youtube.com/results?searc...lique+tutorial