my advice for you my friend is.. do not proceed ... go see your doctor.
the human reproductive system is not the same as an animals and severe repercussions could happen. Using a burdizzo or such is not very effective on humans and can cause infections.
surgical removal of the testicals. can lead to internal hemorages.
and then theres shock and the chances for death from said shock. And if you end up in an emergency room your wife could get brought up on criminal charges. such as practicing medicin with out a license. attempted man slaughter( if you happen to die ). and other various crimes.
Look in to haveing it done at an actual doctors office. you will be made to see a psycologist for a few months befor any doctor will agree to the proceedure but it is possible to get it done and not risk death and jail.