Eligibility criteria to get into technical writing

What is the eligibility criteria to get into technical writing?

- No formal education required.

- But preferably he/she should hold a degree or a diploma in Journalism and mass communication, English literature, science or IT.

- Having good knowledge about software applications would be helpful.

- There are very few institutes which offer courses in this field.

- There are many foreign institutions which offer degree programs in the field.

- Online courses are also available