I live in wisconsin trapped one a few years back. My suggestion would be a 220 conibear trap will kill it instantly like a oversized mousetrap. Use a pole set take a log about 7 feet long and lean it against a tree at about a 45 degree angle then attach the trap on the log and put some fresh meat above the trap any kind will work I would suggest beaver if you can get it it is very strong smelling and will bring it in from a ways. Using the pole set will insure that you get a fisher. Other animals like a coyote or dog will not climb the log. If you use a live trap put a couple stakes down through the top of the trap so that it can not be tipped and discise it to look natural. If you have any questions feel free to pm me and let me know how it goes.
JOE
ps if you live trap it take it a long long ways away it will just come back. they hunt about a 6 mile square area so ive heard