It takes a while Aiko, my parents are against it and wont help me a bit. I've been seeing my therapist almost 2 years now and am about to start HRT and my parents still throw a fit when ever I walk in with a new t-shirt or something.
My mom is just now coming around to it, but still fight with her about once a week. Its taking a while but I think she'll come around eventually, i'm sure your mom will too *moms are easier than dads*
If your a MtF then dads can be really hard. As i'm told by people, no father wants a gay son especially a transsexual son.