The Yourh Hostal can be reach by a few routes this video is from Cluanie Inn direction.

West Highlands, Sgùrr nan Ceathreamhnan, Mullach na Dheiragain and An Socach. 
starting at Cluanie Inn Area.

Scotland 

Starting at youth hostel go behind up the path it cuts right then up through a gate, few more hindred meters of incline another gate, this will take you to the saddle where you go right for An Socach, then back and left for Sgurr nan Ceathreamhnan, you come off the shoulder north west and make you way for some time with many ups and down to Mullach na Dheiragain, small cairn then retrace your steps I cut of at shoulder before the repeat and cut across, hikers choice.

(Munro) Mullach na Dheiragain 981 meters

Lat, Long 57.283325, -5.187123

OS Grid Ref NH080259

(Munro) Sgurr nan Ceathreamhnan [Sgurr nan Ceathramhnan] 1151 meters

Lat, Long 57.25455, -5.222783

OS Grid Ref NH057228

(Munro) An Socach 921 meters

Lat, Long 57.25765, -5.171635

OS Grid Ref NH088230

13 miles 9-11 hours

bog**

hike****

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Cluanie Inn area start point 

https://maps.app.goo.gl/mgT24GnkRjsFYGaL6?g_st=ipc

Theirs a track that starts right of small car park and crossing the main road be very careful as cars come at speed around bend, 2 Miles of track then boggy path to the Youth Hostel, follow fence right at valley end and over style then bridge.

6 Miles 

Bog ****
Hike ***