I can say the lower your dose the smoother the withdrawal will be, however from my past uses, no matter how low I ever got there is always some withdrawal. I could never find a way to get off scott free but it will be bearable and much more comfortable. I'm sure you will be able to make it through this.
I don't know a lot about the methadone. Wasn't my doc,but someone who does will be along shortly. Please hang in there!