I had a run in with the police in NSW and got 4 different infringements for the one situation. The total fine was roughly $1500 and 3 demerit points. I had initially shown up to court and entered a not guilty plea and was issued with a date to appear. I had planned all along to plead not guilty and on the day I was due to appear before the judge, but I spoke to the lady (yes, received legal advice from "some lady") who checks you in to court, and I told her that yes I had committed the offences (and as a result was guilty) but that I didn't know they were offences at the time. She said I was better off pleading guilty and asking for leniency from the judge.
I did not have a lawyer, and was only sporting a character reference from a family friend. I sat in court and the judge read out each case and asked the defendants what they were pleading, and all of them plead not guilty, and it came to me and I plead guilty so she hear my case immediately. She read the character reference, asked me if I would do it again, to which I promised I wouldn't and she decided not to enforce the financial penalties associated with the infringements. I was pretty happy with the result, because at the time that was a stack of money (about 3 times more than the offending vehicle).
Now I know that this doesn't apply directly, or even closely, to your case, but it's just an example of when admitting your wrong doing was rewarded with leniency.
Best of luck in your endeavours!