For example, one of the most pervasive fears couples have is that the mediator is there to make decisions for you, acting as a judge in a slightly less official capacity. However, this isn't true at all. Mediators are only there to do what their title implies: mediate the situation. While they may have suggestions to give, they will never be actively trying to impose their will or decisions over your own.
Another misconception is that only amicable divorces can make use of mediators, who aren't a good pick for high conflict divorce. This is also untrue. Mediators have a lot of practice and skill when it comes to defusing tense situations, and it's their job to be the bridge between two parties that are in disagreement. They're completely neutral and professionally trained in their craft. They can bring other professionals into sessions as well, like family therapists, who can help make sitting down with your spouse to compromise a much easier task.
In the end, it's up to you and your spouse to decide which option is right for your particular situation. When in doubt, having an unbiased third party can do a lot to help you get a clearer picture of your situation and ensure that all parties have their needs met.