Depends on the Judge. Ask you P.O. and see what they say. If there is a possiblity of getting it done without an attorney, the P.O. will tell you that if they like you. Otherwise, call your attorney to see if the conditions of your probation can be modified to remove the interlock. Good Luck.
If you have not had any interlock violations, then there is a good chance the judge will do as s/he said. Ask your probation officer for their opinion, and whether they can make the request. If the probation officer says no, then hire a lawyer for the simple task of approaching the judge and asking for the removal. A lawyer should not charge much for this service.
I always recommend hiring an attorney to handle Interlock removal Motions. I have heard of too many clients getting the run around trying to handle legal matters on their own. Of course, if your probation officer supports the removal then you may be able to handle it with their help alone. Go to dwidude.com to look at information on ignition interlock devices.