Greetings, honorable daoist brothers and sisters ...
Flying is easy, the hard part is dealing with the consequences of having done so. As soon as you fly even 1 inch, your mind will have to deal with the conflict this action creations with every other belief you hold. The amount of stress and fear this will generate is impossible to describe.
However, if you prepare your mind and gently and gradually transform your beliefs through deep contemplation (that is to say, using critical thinking in a quiet, deep, connected. slow, methodical, analytical investigative manner), flying can be as easy as walking or breathing. But by the time it becomes that easy, you won't be a human anymore. You won't be on Earth as you used to know it. You might be on something that looks like Earth and you might look like a human, but you won't be.
Don't delude yourself. You should start small with feats that do not jar the mind so much. I suggest you use the mind to heat your hands. Then try to heat your body. Then try to cool the body. Then try something else, like try to fast for 3 days. Use your mind to make fasting into a pleasant and easy and light experience. When you continually apply your mind like that in small ways, eventually you'll get the point that everything you see is just a creation of your mind and that you've never even lived in any substantial place in the first place. You'll understand that feeling substance is a visionary experience, it's basically like a hallucination that you have no reason to question.
In order to perform various feats without destroying your health you will also have to learn about the flow of consciousness or Tao. If you fly at the wrong time or for the wrong reason, you can hurt your self-image, that is to say, you can create a health problem. So, you don't go around flinging your power here and there, and nor do you have to conserve it, but the point is to do what is right at the time, and what that is cannot be learned from anyone because ultimately you will have to learn to feel it intuitively on your own.
All this takes time and if you strive a little too much or a little too zealously you might become insane. Being insane means you create a conflict in the mind whereby you have uncleared remnants of the old beliefs and also new and vastly conflicting beliefs operating together. This results in disharmony, paranoia, insecurity and so on, because the mind in that state lacks coherence. The good news is that all can be fixed and healed. But do you really have to fry yourself on purpose? The life will fry you just fine, so don't hurry to fry yourself.
Anyway, I wish to encourage you. What you want is possible, but the shift in the mindset that's required is so tremendous that I doubt you will find many sympathizers on this forum.