Divorce Advice for Men | Fathers Rights Divorce | Child Custody

My ex and I were divorced in June 2001 in the state of Texas. We have an 8 year old son. We have joint custody with her having primary custody. I was given standard visitation. In the decree it states that we are to meet halfway between our residences to exchange our son regardless of distance. I moved to Nevada in May of 2004. Since then, I have only seen my son one twice, once in the summer for a weekend and then for a few days during Christmas. Both of those visits were in Texas. My ex refused to let me fly my son up to Nevada for my summer visitation. It is my year to get him for Thanksgiving and now she is refusing to let him fly up here unless I fly down there to get him. She has filed to try and get sole custody of my son and I was served some papers but nothing has happened to my knowledge. I can't really afford to hire an attorney and she has a friend of hers that is a Criminal Defense attorney working for her. According to her attorney, when I moved out of Texas, the order for us to meet half way became null and void. All I want to do is see my son. I pay child support and I have no problem paying for the plane ticket but I can't afford to take off work an extra day and fly down there to get him. I thought about filing a Motion to Enforce the court order but I wasn't sure if that would be enough and if I need an attorney to do so.