I can tell you what some of the obstacles are that a person with a mental disorder is usually faced with.
1.) Having to hide the fact of one's disorder because of STIGMA! You just have to read some of the opinions here on Countable to see that ignorance and fear cause a lot of people to disparage those who suffer from a mental disorder. Many are apparently willing to take away rights from a person, no matter what that person's diagnosis or history is. If you tell someone you suffer from a mental disorder, you risk outright rejection, because you're seen as a threat. You are guilty until proven innocent, when it SHOULD be the other way around!
2.) Difficulty in finding a psychiatrist who is willing to support one's desire to use alternative medical treatments and difficulty in obtaining health insurance that COVERS alternative medical treatments. Many of the drugs prescribed for mental disorders have very bothersome side effects, and some are extremely hard to come OFF of, even if they have begun to be less effective. The withdrawal symptoms can be severe and scary!
3.) People who suffer from a mental disorder can be challenging to live with, and sometimes they get abandoned by people they love and the very people whose support they desperately need.
4.) Therapists can be a problem, especially if you're a person with strong religious beliefs. I know a Christian with a porn addiction, and he is really struggling because he knows it's a sin. But his former therapist said it's no big deal "because everybody does it!" Rather than help you rely on your convictions to keep you from drowning in despair and dwelling on suicidal thoughts, most therapists seem to want to avoid discussing spiritual matters. And while it might be possible to discuss such matters with a preacher or elder or other member of your church, such people usually don't understand much about mental disorders and often feel at a loss as to how they can be of help. And then there's that risk of being shunned because of STIGMA, which often leads to the mentally ill person becoming more and more socially isolated, which feeds their despair and loneliness and anxiety.
5.) Difficulty in holding down a job. It's always a BIG RISK for a mentally ill person to let an employer or one's coworkers know about your disability. Again BECAUSE OF STIGMA! The cancer patient gets sympathy and support; the mentally ill patient usually faces suspicion and/or fear, if not outright discrimination. It can be very hard for mentally ill people to have lasting relationships of any kind!
How do you get society to educate themselves about neurobiological brain disorders ('cause that's what most mental disorders are)?
How do you get communities and families to provide the social support (and job support) that the mentally ill need?
And how do you convince healthcare providers and insurance companies to treat mentally illnesses the same as any other physical illness? Anyone care to argue that the brain isn't part of one's physical body??? Mental disorders aren't just a case of distorted thinking, though that can certainly play a part! But there is almost invariably a physical component to the disorder. Why should they get less coverage?
I know all of this, because I have a family member who suffers from a mental disorder.