I am in the same position as you and have chosen to leave my full time job. A part time course is an option, but I feel that I would struggle to keep on top of my studies AND work full time. I really want to dedicate all my efforts as it is the last shot I am going to get! Contact time for my course in the firt year is 12-15 hours but you cannot guarantee what days or times that will be. Unless you work in a flexible job, it will be hard to now what part time rota you would need until nearer the time.