Regarding ACIM, I've outlined before that whom and/or whatever was involved in writing this book, had a very good understanding of how the conscious, personality mind interacts with the subconscious, soul mind and vice versa. The beings involved understood hypnosis, suggestions, and how the subconscious mind works.
ACIM is written in a manner that is so repetitive, that is extremely boring to the conscious mind, lulling it into inactivity and thus allowing the subconscious mind to become more active and sensitive. It then injects suggestions formed around the problems or the things we are trying to transform. That is what the emphasis is on, and that's what gets programmed into the subconscious mind as active suggestions.
When reading it, I found myself becoming MORE egotistical in nature. I also had the odd experience of nodding off almost every time I read it for more than a brief time. It wasn't until I had a dream related to this work and that it was spiritually hindering and limiting in nature, that I really questioned it. I also started talking to Albert in a more personal way around this time, and there was the synchronicity of him getting messages from his guidance against it. The combo of the dream and the synchronicity, really made me pay attention and I dropped it then and there.
I agree with Albert that the human body ego is not all bad or negative in nature. It actually serves a helpful function until a Soul is strong enough to not need it anymore. Overly trying to surpress/repress one's ego, often backfires and causes more problems in the long run. It's similar with sexual energy.
Both the ego and sexual energy are best handled by "redirection" and transforming through the power of Love and attuning to Source within (which is easier to do through deep meditation). Repressing or suppressing either artificially, can cause a person a lot more problems than having a normal or temperate expressing of or attunement to these.
Trying to get rid of ones ego without the above process, is like pretending one is not hooked up to a physical, animal body that is largely fear and survival based. Good luck on pretending that! (which is why I don't anymore). I've become more relaxed and laid back towards both self and others in this area, which has led me to become more tolerant of self and others. This has been a good/constructive thing. I now don't feel the need to demonize self or others according to our naughty, bad ego. I just recognize it is part of life/experience here, accept it for what it is, and try not to let it overly influence or control me too much (occasionally it does, but that's also ok).
I use to really deeply worry about ego and my ego. I use to think that I needed to be or should be perfect like Yeshua. I then realized, even Yeshua had some of that until his body died and he created a thought form body patterned after it. If even Yeshua couldn't fully transcend the nature of the body while connected to same, and he was born with a unusually fast vibratory body, and was from and of Source Consciousness, what chance do I have to do it? Yeah, face/beliefs meet wall/reality.
I do try to remain open minded to the possibility, but I don't dwell on the issue anymore. Meanwhile, I just try my best to open up and attune to Love while connected to a body--hopefully bringing it along some, if not all the way.