We did this route on the 24/07/2020 on a really nice day.
We did it in the other sense, so we started doing Slieve Binnian and Slieve Binnian East Top.
Climbing Slievelamagan may result a bit harder due to the big rocks there are there, butyou get used to it and just try to be more cautious.
From Slieve Beg we followed the path marked, you can see it on the map, like a reverse U, since there was one and we didn't need to cause more erosion to the site.
Recommended trail without a doubt