It really depends on what evidence is set against you.
The Representing yourself in a case where you are clearly innocent by the evidence is easy enough.
The issue is procedure.
The best example of this in fiction would be an episode of the Drew Carry Show where he does a HORRIBLY incompetent job at defending himself... but because Courts are about evidence and not performance he is proclaimed innocent. That is around what I'd HOPE it would go.
"Clearly innocent?"
"Issue is [only] procedure?"
There will always be clients who insist upon this; there is no such thing. Fairy tale. The prosecutor isn't ethically allowed to bring a case without a good faith basis and if they have evidence tending to prove the innocence of the accused, they must disclose it to the defense. If he doesn't, and its found out later, or heaven help him the judge gets pissed about it, he gets in severe trouble for it. This is clearly erroneous thinking that there is even such a thing as black and white in the world. Makes for great TV, but doesn't exist in reality.
These clients are the second worst type and they try not to pay because "the case was easy, all you did was the paperwork." Like seriously, they try not to pay me even when I win.... They don't understand their case at all. They refuse to see the prosecution's side of things and so they have no chance of beating what they won't even acknowledge exists. They're trying to fight with their eyes closed and their fingers in their ears.
Found that non profit I was talking about! Though they changed names or merged programs or whatever since I was helping out a years ago:
And, it looks like they've done an excellent job. We've had text guides on our website similar to this but tailored to Northern Ohio basically forever. This is basically what we tell our clients; we never had videos before though.
http://www.flexyourrights.org/faq/keep_police_from_searching_car
If you're wondering who that dashing Attorney talking to the courtroom full of concerned citizens is, that would be this man: (named founding partner, former judge)
http://billymurphylaw.com/people.php?PeopleID=5
Disclaimer you need to read: 1st, you don't have to buy the DVD; the free Youtube clips are excellent. Second, this is excellent generalized advice; remember what I said about enforcement and rules varying? They do; it matters. If you've been charged with a crime or are under investigation, contact a locally licensed lawyer ASAP. DO NOT THINK TALKING WITH THE POLICE WITHOUT A LAWYER WILL HELP YOU. Do not rely solely on these videos for any defense, they are an excellent preparation to help a lawyer mount a court defense. I don't recommend trying anything on your own. You have the right to remain silent. Use it. You have the right to have an attorney present. Use it. These rights exist for a reason. Use them.
Law is not and never can be a magic formula. It's all about prosecution and defense convincing the judge there was or wasn't probable cause. You can make it easier on yourself and your attorney if you're prepared. You don't know your rights, period. On average, you really don't know your rights if you think you do. Do not provoke the police. You don't "fight" the police; lawyers do. Your job is to be the most model upstanding citizen possible in a police encounter and give the police nothing, NOTHING to use against you while making it easier for your attorney to help you.
Some additional tips:
IF THE POLICE SEARCH YOU ANYHOW WITHOUT CONSENT: stay calm. If they search you anyhow without consent, then your lawyer has a better chance of winning your case in court. Most police searches happen because police trick people into validating the searches by consenting.
Refusing consent is not probable cause in and of itself.
You now have to actually say, "Officer, I am invoking my right to remain silent and want to speak to an attorney," for your right to remain silent to attach. NOT: "Maybe I should speak to a lawyer." NOT: "I don't want to answer your questions." There are a million little things like that, hence why I will say again that you should never do legal things on your own, always consult a locally licensed attorney who can practice law in your jurisdiction.
Edit: Clearly, this only applies to the US.
I watched pretty much all of those ten rules things, I have to say I really liked it. I feel a bit safer knowing the 'right and legal' way to speak to the cops. With all the news I hear about amendment violations, it frequently feels like the bill of rights is just an imaginary thing nowadays, but I like being reassured that it still matters.
It helps, but keep in mind, that's the way it's supposed to go. It doesn't always. Like I said, still a very good guide for how to deal with police. Murphy is doing a public service.