Can I fire a retained counsel?

Depending on how far into the trial you are, the judge may view it as a detriment to you to change attorneys at this point in time. This is due to the fact that the current attorney has prepared a specific case and created various documents, both of which would have to be recreated by any new attorney. Additionally, if this is an ongoing trial where witnesses have already testified and evidence has already been submitted, it's rather difficult to try to "start over" with a new attorney when the judge or jury has already heard part of the case that the previous attorney put together. If the trial has not yet started, then there shouldn't be anything preventing you from firing your retained counsel and hiring a new one. However, if you've already been to court multiple times and the trial is underway, then it may be best to try to work out your differences with the current attorney.