The piece of flesh indicates something restless in the physical being which stands by its restlessness and excessive irritability in the way of the full flow of the Ananda. In the dreams this became active and was eliminated by the pressure of the psychic.
The right attitude is to have faith and not mind the difficulties. Difficulties — and serious ones — there cannot fail to be in the path of yoga, because it is not easy to change all at once the ignorant human consciousness and make it a spiritual consciousness open to the Divine. But with faith one need not mind the difficulties; the Divine Force is there and will overcome them.
The danger of the mental forces is when the higher consciousness descends they tend (unless there is a deep silence) to become active in the consciousness for forming ideas of a mental type which can be misapplied. First there should be a basis of entire calm, peace and silence, if there is activity, it should be that of a knowledge coming down and the mind silent receiving it accurately. This you can easily have, provided the mind is quiet.
The danger of the vital is that of taking hold of love, Ananda, the sense of Beauty and using it for its own purposes, for vital human relations or interchange or else some kind of mere enjoyment of its own.