Is it difficult to find the hiking trial from Zhang's guesthouse,along the river and up to Walnut Grove along the Yixiantian trial?

It is not very difficult, but the route may be like this: Zhang's Guesthours, Yixiantian and then Walnut Grove.
The taxi may be hard, but you can hire a car with other travelers to reach Zhang's GH. I walked to reach there, so I am not very clear about the fee of car, but I heard the it is around 100 to 150RMB.