Do you see that tower at the top of the mountain north of the valley? That's where you'll find Gass Peak. You may or may not be able to see the tower easily but trust me it's there. I think there's even a few blinking lights that's visible at night. The peak lines up almost directly with the Strip so you can easily see the farthest east and farthest west edges of the valley from the top.
Getting to the trailhead requires you to do some off-roading a few miles in the middle of the Desert Wildlife Wildlife Refuge. Using a 4x4 vehicle isn't required but it certainly helps and makes it easier. You don't want to be stuck out there. I probably could've made it with my non-4x4 SUV.
The hike itself can get difficult because a number of things but it's not extremely difficult. I would do a few easier hikes to prepare for this one especially if you haven't done a hike for a while. There is no shade so it can be hazardous on windy, sunny, or rainy days. There are parts of the trail that disappear. There are also parts of the trail that are steep or slippery where if you were to lose your balance or footing you'd get severely hurt. But for most parts the hike is just hiking or walking on an incline. I've read different info on how long the hike is so I'll just say it's at least 6 miles so you'll probably going to be out there for a few hours especially if you take lots of breaks, breaks are a good thing. Make sure you write your name in the notebook at the top or not.
I'd do this hike again. I kind of want to know how the view is at night or at sunrise or sunset.