Good Luck on that. I once spent 2 days looking for a specific kever there, and I knew the section and area. But I couldn’t find the section! I finally got a “map” from somebody in a hut near the parking lot. It was a FLAT depiction of the sections; each one in a different color.
Problem was…. HAR Hamenuchos is a HAR. It’s a mountain. It is high, and it is round. In order to follow the map to the section I needed (I believe it was called Gush Vav), I walked in the direction indicated on the map. It took a while for me to realize that I was climbing OVER the top of the mountain, and trying to make my way down the other side!!!
There were few helpful “streets” or section dividers, or indications of where the staircases are located on this very steep mountain!
The only ones who have a better way of locating a specific grave, are the INDIVIDUAL chevra Kadishas. You have to know which Chevra buried the person, and get directions by calling that Chevra.
If you are looking for famous Rabbanim, and you aren’t particular, It is quite easy to find the “Chelkas Harrabonim”. That is where R’ Moshe Feinstein, The Belzer Rebbe, Rav Shneur Kotler, I think Rav Isser Zalman Meltzer, and countless others are buried.
You can find that chelka because for most of the year, there is a bright blue tarp over that area, which was erected by the Belzer Chassidim for protection from the sun while daavening at the previous Rebbe’s Kever! If you go into this area, you will find many, many familiar gedolim and talmidei chachomim buried there.