I hiked this & many other trails on 09/08 during my first visit to Hawai'i & posted a vlog! Search "Nikko Gandia Travels" on YT.
The trail felt moderate to me. The incline is abrupt, take breaks when needed and enjoy the views. Consider bringing a walking pole or stick, going back down may be more difficult for some. Small section towards the top without ground coverage - take Murphy's bypass to avoid this (look for sign). Great views of north, east, and south O'ahu at the summit.