Altering them will not affect your life in any appreciable way. They will not make you more passable, nor more acceptable to others. I know where you can get some hormones . Taking hormones without proper medical supervision, including blood tests, is asking for it. Street hormones are often not what they purport to be, and the supply is problematic.
Plastic surgery is expensive.
Silicone injections are cheap. And dangerous . The medical literature is full of reports of people with serious medical problems caused by injected silicone. Turning a few tricks is a good way to pick up some cash . I realize that prostitution is sometimes forced upon transsexual and transgendered women because of societal prejudice, but I urge those who do turn to sex work to use safe sex techniques and avoid the use of shared needs for IV drug use or for injecting hormones.