What kind of fish is it? Call me morbidly interested.
Ditto to the tupperware/bucket suggestion. I'm not sure how big your tank is, but I would recommend 1 person, 2 nets.
If all else fails, go to your LFS, find one of their fish-catchers, and offer them $20 to come over after their shift. I had a buddy who had to do this, he just couldn't catch a wrasse in a 90 gallon. The guy came in, and five minutes later, the wrasse was bagged.