This book is NOT at all in the tradition of Rilke's Letters to a Young Poet. This book is, however, in the tradition of arts teachers playing armchair psychologist to young people and of people with more power and agency to abuse those who are seeking their help. In the case of mentors, this abuse tends to be most invisibly but damagingly in first assuming that youth means immaturity, and inexperience and access to an abundance of resources, including time, energy, and art supplies, but unconsciously clocking that one of those resources is likely not better and less abusive arts teachers than they are and then using that likelihood to their advantage. In letters, Cameron does in spades...all while passive-aggressively pretending not to.
First of all, Rilke was writing about his experiences and to real person who later had his letters published. Second of all, he wasn't a jerk.
Instead of humbly offering her own experience and encouragement to someone whose position she admits to have occupied at one point the way Rilke does, Cameron vicariously chronicles her own opinions of youth and young artists by creating a straw poseur artist to mentor, chiefly by correcting their tendency to seek guidance in the first place while ranting and railing against any perspective but her own...and then offering insights that actually address artistic development only when seemingly forced to get to the point. That no one clocks she is doing this is likely because we're used to seeing this "teaching technique" used by other mentors to "help" real artists or anyone else in high-stakes/low-success rate vocations. Not noticing that we are rarely exposed anecdotally to any other path or relationship model, but knowing the world persists in producing fine artists (or baseball players, or CEOs), we illogically conclude that this is because the tradition of abuse must have played a positive role in their success and not a negative role in the failure of everyone else, or that the two are one and the same.
I beg to differ. Having had many healthy mentoring relationships and teachers and coaches in my life, I know that there is another, better way, and that it's possible to find someone healthy, honest, and successful to help guide you in almost any technique or industry you wish. It only takes finding them while weeding out and surviving the bad experiences.
So, IMHO, instead of internalizing the dysfunction of someone who treats you like this, if you get an arts mentor who talks to you the way Cameron talks to the straw young artist in this book, RUN. Or at least have the good sense to realize that you wouldn't live with a lover who talked to you like this; you wouldn't encourage a parent to "teach" their children like this; and that you certainly shouldn't let anyone help "develop" your life's work and future like this, and keep this person at yardarm's length.
(For example, Cameron repeatedly and admittedly> opens her letters in a condescending voice that admits that her previous letter contained assertions and attacks or phrasing that addressed her imaginary supplicant in ways that she intended to anger, frustrate, and provoke them for no real reason, she quickly follows the admission by repeating the behavior, and then leaves any cogent, loosely relevant advice to be had to the endof the letter. She is consistently congratulating herself to the student for having ticked them off, but only congratulates the student when they have submitted to her abuse or conceded her point by praising them for having "learned" something from what she had to say in spite of her unnecessary attacks. That's a known abusive dynamic and a technique of ambient abuse to take advantage of such trauma bonding by encouraging dependency; it's an advanced technique to do it while verbally encouraging independence from people who obviously think they need your advice already. And if you think I'm exaggerating about this or overreacting about the negative effects of this kind of bullying, please do some research into the tendencies of emotional abusers, especially on victims' forums. Look for detailed, first-person accounts of techniques if possible, and then do some research workplace bullying and long-term effects on productivity and mental health. It's a serious problem and what's worse, it's completely unnecessary and destructive to individuals and to the industries in which they work; so I take it very seriously.)
Instead of picking through the unnecessary nastiness and codependent combativeness in this book in order to get to the decent although basic advice, I suggest picking up Rilke's original or Anna Deveare Smith's version, and any number of straightforward or insider's career manuals and biographies. They'll tell you a lot more about artists, their processes and their struggles, and the hurdles they cleared in their career paths than any (straw) youth-bashing second-person assertions disguised as a "teaching tool" will.