While you could do the variant suggested here by yourself, and as a 1 day hike, it's highly recommended to organize a local guide in Garmarud. There is a lot to learn about the Iranian flora, fauna and culture, and the hike is not even half as fun if you don't dive into the local culture and learn more about this beautiful mountain region. A second very good reason to take a guide is the fact you'll be in much safer hands when it comes to judging the condition of the trail, which can vary heavily based on seasonality and weather. And third, you'll have a hard time finding drinking water on the way without somebody with deep local knowledge!

In any case, make sure that you wear very good shoes in this terrain, and always have enough water with you!

If you are already hiking to Piche Bon, consider a through-hike towards the Caspian Sea, take a cab to Gilebom Lodge - https://blog.persiaport.com/en/5-unforgettable-ecolodge-experiences-in-iran, where you'll be welcomed by the most amazing hosts, and can treat yourself with amazing food, in a tiny paradise, next to the Gilean Jungle.