This is a tough situation to be in. If the other side has hired a lawyer, there is an imbalance of power. In this situation, you can still mediate if he agrees. But here is how this would work: Kelly would be a neutral mediator. Your husband/wife would have a lawyer. And you would represent yourself.
Thus, in this situation where your husband/wife has already hired a lawyer, we recommend that you also hire a lawyer. The case can still settle, but Kelly would not be a mediator in your case. You can hire Kelly to be your attorney – the first step is to book a legal consultation.