There is no such thing as a guaranteed verdict once a case goes to trial. The outcome of a bench or jury trial has many factors beyond just the defense attorney. The evidence, the judge, the prosecutor, and the makeup of the jury are some of the factors that determine a verdict.
Sentencing can also vary within the ranges set forth by California law. Misdemeanor jail terms are capped at 364 days.
A skilled, knowledgeable, and experienced attorney can mitigate the risks at many steps in the process, working to suppress unfair evidence exhibits, seeking dismissal of the case before a trial, exploring plea bargains, and monitoring options for an appeal if a trial results in a conviction.