From US-82, Village of High Rolls, turn onto a signed, West Side Road (FR-90) and proceed to the DRY CANYON TRAILHEAD (large brown forest sign). Do not confuse with the Upper Dry Canyon Trailhead which is also on West Side Road. At the Dry Canyon Trailhead turn off West Side Road onto a dirt road to a sign listing various trails, including the "A" Mountain Trail. Sign says its 1/4 mile ahead where you will find a "A" Mountain Trailhead sign. That final 1/4 mile section is narrow, rocky and uneven. If you lack a high-clearance vehicle best to park and walk down the road. The "A" mountain trail #119, is an old 4WD road and its obvious ATVs and other 4WD vehicles continue to use the road. To get to both Ortega and Hershberger Peaks, hike down the road ("A" Mtn Trail). About 3/10 mile from the TH you will pass the user trail to Hershberger, located at: 32.88421, -105.86238. If headed to Ortega continue on, the trail heads towards the peak and passes fairly close by but you will have leave the "A" Mtn trail and gain the ridge on the south side of the peak.. There's a user trail on the ridge that goes up the side of the peak.
The hike up Ortega Peak was nostalgic for me. Some friends and I hiked up this mountain from Alamogordo as kids around 1965/66. It was my first highpoint.