I've found that what often limits me the most from trying something new or following advice is my not fully understanding the concept. I've noticed a huge difference between knowing something on the practical level and actually believing it to be possible. Those are the conscious and subconscious minds; I only heard about this specific wording today, which matches exactly what I've noticed!
Your conscious mind is something that you can communicate with directly. It's the voice in your head that commands your body, and you can hear talking with real words. Your subconscious is that back voice, the one you don't hear, but you feel it is there, which dictates your body's deeper emotions and motivations. A real-world example would be giving a friend advice, and they understand it and even repeat it back to you in their own words. But their subconscious doesn't fully comprehend it, and they inevitably don't take your perfectly reasonable and sound advice.
I've found this is an absolutely massive factor in my own learning and understanding of new ideas and concepts. I rarely hear something and immediately try it out, even if it makes perfect logical sense and there is proof behind it. I have to mull the idea around and get confirmation from other people that it's something that works; if not, I put it away in my mental filing cabinet to do more research down the line. There are so many concepts and ideas that I didn't do or completely understand when I first read them that I would just put on the back burner; that has come full circle, and I do understand them and now have the foundation to build something on.
1) We won't do what we don't understand on our subconscious level
2) Something might be completely logical, but you don't take action on that; you are normally not convinced it's worth doing
3) Realizing that any new ideas won't turn immediately into actions helps you keep that idea on the back burner for when it does click for you
4) No learning is ever wasted