Yes, probably is. Kakashi and Jiraiya can do it one-handed, Minato made the technique and children like Naruto and Konohamaru can use it. However, I think you need to have an inherently large chakra reserve.. not too long. For example, I doubt a sick Itachi could abuse it if he knew how to use it. Minato, Naruto, Jiraiya obviously have quite large chakra reserves, Konohamaru is a Sarutobi and can use Multi-Kage Bunshin no Jutsu and Kakashi could abuse Kamui meaning his Chakra Reserves are huge at this point.