I'm in the same boat as you.
My self-cut sim is also stuck inside my iPad2.
Luckily it is working so no problems at this stage.
I've done a lot of reading(www) and there does not seem to be an easy solution.
I phoned a place in CT and they claimed that they might be able to remove it - alternatively they would have to open the iPad to remove it(that was not an option for me).