I always get wordy and jumbled when I address these issues -- I have much left to learn. Because of that, I'll offer only this:
If you don't understand the essence and energies and person and nature distinctions, you will never understand proper Christology and how Christ assumed our human nature, yet without sin, and healed it. The "yet without sin" part becomes "oh, so it was a sinless/perfect/illumined/glorified nature," which is very Western in understanding and, IMHO, muddles things greatly. Christ was without sin, because sin is personal and Christ did not sin. The nature He assumed is our nature, fully. There is no "sin" at the level of nature, because natures don't sin, people do. What Christ did with our nature is illumine it in His person with the Divine energies which are part of His divine nature.
I hope I didn't mess that up too badly.