If you are in Delhi.. then first try to reach tanakpur . you can reach here by bus or train then from tanakpur you can get a direct bus or cab for munsyari.
Munsiyari is located on the entrance to Johar valley which lies in the ancient trade route. By air- Nearest airport is Pantnagar airport. From here 249kms away is Munsiyari. By rail- Kathgodam is the nearest station that 275km away is Munsiyari. By road - From Delhi you could try Haldwani - Bhimtal route. Another route is from Delhi via Kashipur you could take kausani route.
You can take Delhi- Nainital- Kausani- Bageshwar-Munsiyari Route. have completed that part last month all roads are good apart from few patches. do consider the snowfall as well this time