Criminal Law Questions? Ask a Criminal Lawyer.
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It should be done with a lawyer. The reason is that, because there is a bench warrant, he could be arrested at any time, and that means that he goes to jail pending a court hearing on the matter. If he were to get an attorney, he could file a motion to "quash" the warrant, which would allow him to try to pay the fines and handle the matter without going to jail.
But if he were to turn himself in, he almost certainly would go to jail pending the hearing. That doesn't mean that he would be in jail a long time (although it could, depending on when he turns himself in, if the judge is going to be hearing cases that day, etc...)
As such, getting an attorney to handle this matter would minimize, if not completely negate, the time spent in jail, as he would be ready to bail him out of jail (if need be).
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