You are not supposed to do this... but

... as a temporary fix until you can get a new cat...
You can go under the car and disconnect the main cat yourself... 4 or 5 bolts, may be the same size as the spark plug socket... and use a hammer and metal rod or long drill etc. to remove the materials inside... OR at least to remove the material which is colgged which would be in the front of the cat, closest to the flex-pipe.... then get a used cat from a pull-it-yourself dismantler or whatever... in any case you can replace it yourself with just a pair of ramps and a wrench.
Oh yeah... yours will have O2 sensor to remove as well... once you've loosened the o2 sensor you can remove it by hand.... shouldn't need the special o2 sensor socket either.