If a defendant declares themself not guilty at arraignment is it mandatory that the case go to trial?

Typically, at arraignment, you will always enter a not guilty plea so the lawyer has time to investigate the case and review all the discovery...

How do I go about firing an attorney who has been working on a liability case for our family?

You should immediately send a letter to the attorney (by certified mail if possible) and keep a copy indicating you no longer need his services. ...

It is unclear why you were arrested for obstruction. I believe if you wanted to sue them for false arrest, you would need to beat the obstruction...