I'd suggest you make sure what the consequences of the conviction would be first, and then decide.
It is not only saving money on the fine (the lawyer's fees would probably be the same as anything you might save) but any residual consequences. A lawyer might make a call and get the charges dismissed, or ACDed (dropped if no further charges are made within a year) or changed to something less embarrassing on the record that carries the same fine.
Paying for 1/2 - 1 hour of a lawyer's time for a consultation and a call may pay interms of peace of mind.
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