Just completed trek to Indrahar in the month of May (2018). I must say that guide is absolutely necessary with all the equipment (rope, harness etc). This is because there is still snow on the mountains at least up until June/ July and the trek (specially descend) gets really slippery. A slip of the foot here can mean a certain death. So please take a guide and hire a professional with all the paraphernalia. Do carry gloves & torch as well as the climb and descend to Illaka have to be completed on the same day making the trek almost 12/13 hours long. Most of my fellow trekkers had a close shave with death due to slippery ice (ice and grass becomes slippery due to melting snow during afternoon and the fall is very steep). So be careful. I would rate this trek as very difficult.
