Non-surgical medical treatment is generally the most fruitful. (SRS, or GCS, is a surgical procedure involving construction of genitalia, and up until very recently there weren't any decent options for it.)

Unfortunately, therapy alone generally isn't shown to make suicide rates or gender dysphoria go away.

Elsewhere in this thread I posted a link to a great talk that has the leading expert in transgender care go into extreme depth on methods of treatments for transgender patients. If you want a doctor's perspective, and one that has probably the most experience tied to it (he sees an incredible volume of transgender patients), I definitely recommend checking it out.