How do you go about enforcing a judgement?

There are a couple things you can do here.  the most important is locating the debtor's assets and figuring out what if anything he has.  however, some things are exempt from garnishment such as the debtor's primary car.  I suggest that you hire a lawyer to do an asset search.  if the debtor is employed, you may file a wage garnishment with his employer.  the employer will take money from his paycheck and give it to you each pay period until the judgment is paid off.  you may also file court papers to have your lawyer force him to appear in court and ask him questions as to where and what his assets he has that may be taken.  If the debtor has a bank account, you may take the money from that account.  Again, hire  a lawyer to help you here.