He studied in a Europeese Lagere School in Samarinda before going to Genrum MULO in Batavia (modern day Jakarta).

[6] Hamidhan remained as an editor and was under intense pressure from the occupation forces, receiving several warnings for his writings.

[5] In 1945 Hamidhan was chosen by the Japanese as a representative of South Borneo at the Preparatory Committee for Indonesian Independence (Panitia Persiapan Kemerdekaan Indonesia, or PPKI) in Jakarta (renamed during the occupation).

[3] On 18 August the PPKI had its first meeting, where President Sukarno indicated nine members[Note 1] as a subcommittee tasked with deciding urgent matters regarding the nascent country's policing, defence, subdivision, and economy.

This he published in Borneo Shimbun, including the entirety of the proclamation, the constitution, and an announcement of Pangeran Muhammad Noor's selection as governor.

He also helped establish branches of the National Party of Indonesia, People's Security Body, and governing boards.