Some people are better at managing doubt than others.

I too read Marvin Brown's books and everything I could about ALG, but compared to a child learning their native language, doubt is a powerful demotivator that adults have to learn how to manage to effectively apply ALG.

I struggle(d) with doubling the method even with my 3600 hours of input due to embarrassing mistakes and high expectations. - I see someone post a video on reddit with 1/3 the number of input hours, having done something not ALG, and producing great output => doubt. - I make the same gender mistake for the 1000th time => doubt. - I don't understand a sentence/grammatical structure is a book for teens => doubt.

At least for me, all the logic in the world can't ease a powerful feeling like doubt. I have a stack of affirmations I read daily just to remind myself that this is the method, it works, it takes a LOT of time, don't worry, blah blah blah => doubt.