1st time drink driving offence. 1st time offence ever.

Convicted Driver Insurance
Good afternoon
I’ve been arrested for drink driving (last week),
My hearing is on the 17th of May, breath test result was 89 milligrams, I don’t know what to expect from this, what is gonna happened in the court. I can’t afford a solicitor so need to represent my self and I really don’t know how to approach the court. What should I say? It’s my first ever offence, I’ve got clean criminal record, clean driving license, good opinion at work. I’m a self employed van delivery driver and person I was subcontracting for last 7 year agreed to write a reference for me - can I use them in court? What to say? Can I be imprisoned for my action ?
Please advice
Kind regards
K
 
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