Just for interest sake, my medical aid has paid around $2000 dollars worth of mental healthcare bills in total over three years (it's a lot for my country, but a fraction for Americans). I'd say the value/progress received from the mental health route has been utterly slow where a handful of mushrooms has had the best effects of my life. Going the shaman/Aya route is like pouring paint stripper on your soul, where you can then have a peek at your inner workings - its is not for the faint of heart. I do not regret doing it but I also advocate caution. You cannot unsee/unfeel the things you experience, some of it is positive and some might be negative.
So yeah, all round worth it to do it via a shaman. Especially if you have tried normal mental health care and you aren't making progress. I feel all adults should do it as a rite of passage of sorts, especially anyone in positions of power.
As to shamen part, I do recommend reading the book. There’s a lot on “set and setting” which goes into this.