My favorite way is to go to Hidden Valley. Once inside hug the fence on the right. Take the second opening. Kill a few Bark Scorpions. Skirt the Black Mountain Crater, maybe meeting Moe & pals, then follow the narrow canyon SSE. Try to get some elevation so you can snipe the Radscorpions. You'll come out by Helios One.
This is a fairly easy route; there's some combat but it's manageable if you are careful.
Oh, you're so close you're glowing, lol. :icecream: :foodndrink:
Actually, the way I was talking about is THROUGH Hidden Valley easily just dodging the Bark Scorpions and down the ledge towards Neil's Shack. (I have been going ahead and waiting for his forced greet on the road just below.) Go back down the road a few feet and then up a little hill to the right, and follow the rocky area around the inner rim to where a dead NCR guy is laying. (You're pretty far from any muties in there, but I still sneak and keep a watchful eye down in their camp.) Anyway, there's a path down by the NCR guy to your left up the hill lined with bear traps, but you can avoid them if you don't have the repair to disarm them yet. (I usually don't at level 2, lol.) Just find each trap and side step it and go straight up the path and over the hill towards ROBCO and you're home free! Coming back you have to get to the higher level and work your way down to the path that leads back to Niel's area.
The best thing I've discovered with this route is that it's easily repeatable in both directions and there's no combat to waste your ammo on this early.