I really wanted to do this without lawyers but again he has lied and blindsided me.
You don't have to use a lawyer to proceed but you SHOULD consult one prior to mediation.
Mediators can't give legal advice. So if you have any questions arise you won't have a resource. You can consult with a lawyer privately, and then go through with mediation well informed.
Some lawyers will have a free initial consult with the hopes you'll retain them after. Inquire! Or, some employer EAP benefits have resources you call for a free consult.
Paying for an hour or two of lawyer fees while expensive will give you the peace of mind that you advocated for yourself appropriately. Your H may or may not find out, and may react angrily. Too bad. You can tell him very honestly that you felt it was best to have the agreement reviewed.
