Believing that enlightenment is possible without having a foundation of mindfulness and other practice will do you as much good as believing there's a magical teapot orbiting the Earth.
Come and try it for yourself. Apply with sincere effort just one of the Buddha's teachings in your life. Does it do what he said it would? In my experience, it has. If not, I've always later found there was something not quite right on my end. In that way, I take it on good faith that the other teachings are also sound and wholesome.
I take things one step at a time. "That worked when I was happy earlier. Now I feel like crap. Will it still work? Oh, it does."
"Even a sliver of mindfulness in my day has given me great equanimity in difficult situations. I wonder what more mindfulness will do..."
Trying to consider all of the teachings at once is like trying to swallow a whole pharmacy. Befriend your ignorance and ills, then apply the appropriate medicine the Buddha prescribes.
If you don't feel ready to take the precepts, don't. Try them out first. See how concern for all life, even insects you carelessly trod on before, affects you. See how mindful and careful speech affects your relationships. I think you'll find the precepts have a funny way of making you get out of your own head. Then you'll be eager to take them for the wonderful good they do in the world around you, and not solely the benefit you can derive.
Hope that's helpful
Good luck in your adventures!