The title of a technical writer originally meant someone who was trained in a profession and also has the skills of a writer, effectively able to create documents using the language of a trade. A technical writer is now a more broadly applied label, and there are plenty of skilled writers available who are able to research professions and write about them in general. Find a technical content writer on the web by visiting a website that helps to identify your options.
A high level writer is someone who effectively has two educations and can draft instructions with intimate detail. Find these writers, compare prices, and find something that is the perfect cross section for your interests. Find more general writers who might have researched a field in the past and can describe issues that concern it without having direct industry experience.