Divorce Support Forums: Question

I am currently undergoing a very hard custody battle. My soon to be X tricked me into signing a very bad agreement with the help of his lawyer. I at the time had retained an Attorney but, this Attorney didn't file anything so my soon to be X tricked me into believing that the children were going to be better in sleeping in their own beds and that if I needed to find a place to live I could do so and get back on my feel as well by studying on the days the children are with him which are from S -Th and the weekends with me. At first I thougt it was 50 % and 50% but then when I started to look into it further it was not equal. So anyway I made a realy stupid decition to signe the document without having my lawyer see it. It is now court ordered. After the document got court ordered we went to mediation in which we drafter another agreement but it won't take effect until the hearing of October 20. In the mediation agreement we stated four days with mom and three days with dad. I would like to contest it to get physical custody now that I have an appartment and I can take care of them without more worries and threats from my soon to be X. Can some one shed some light into this. I am very nerveous about the destiny of the children they are only three and four. Dad has always worked and because he is self employed he states he can make his own schedule.
I am currently working with another group of lawyers and they seem to be filing a lot more papers then my old lawyer.
Thank's