A man who is his own lawyer has a fool for a client...
Not always. I'm not a lawyer, but I have represented myself twice in civil court and beat the crap out of both companies legal teams (one of which is a FTSE 100). I can't afford to spend money on solicitors & barristers to attend small claims court on my behalf, because their costs are not ordinarily recoverable.
I would agree that representing yourself in criminal court seems unlikely to succeed. If you had incontrovertible evidence of your innocence, your file would probably not have gone to the CPS, the CPS probably wouldn't have approved chargers and brought a case. You're going to need specialist help to ensure you don't fall prey to some legal shennanigans 101 trick.
Biting the hand that feeds IT
