These aren’t easy tours so its important that you are a confident rider. I had never ridden on dirt before riding in India but I managed alright. We rode in mud, through rivers, while it was raining, with 5m visibility up the Rohtang pass with no guard rails in 10°C temperatures.
While we’d recommend having about two years recent riding experience, it is more important that you are a confident rider. If you can lane split in city traffic then you can dodge sacred cows, Tatas and oncoming traffic on the wrong side of the road.