This is what i totally disagree on, the only way you are going to get nothing from a trading school is if they the teachers doesn't knows the craft or you as a person can't comprehend what you are being thought, because the candle sticks is just like a language telling you something about what the market is about doing next, so if you can't read the candle sticks or do technical analysis as we usually call it, you are bound to lose money in the market because at that state, you are diving into the market blindly.
Then as for mentorship, you are actually right on that aspect, it's quite costly, but if you have the financial leverage to afford it, invest that money on yourself because it's going to worth it in the very end.
There are many materials on technical analysis that you can study without a mentor, that is, before thinking about trading courses (if you think it makes sense), then try to study the base yourself. Or if not yourself, then with the help of those materials that are available, there are also many video materials, not all of them are equally good, but there is something to choose from.
Try to find a public trader to follow, choose one who has success in trading, such guys often do technical analysis online (even before transactions, which is important), so you will begin to understand more. See how capable you are of understanding the basics of trading and then decide whether you need it or not.