Hampta Pass is not an easy trek. But it is definitely a popular one. Shepherds can be found grazing the meadows that fall on the way, but you cannot rely on their availability to figure out the trail. If you are a seasoned trekker, who has done plenty high-altitude treks and have sufficient equipment and maps to mark the trail, then maybe you can attempt Hampta without any guide. But it is always suggested to take a guide along.