Can technical writing be both good and affordable?

I need clear technical content for a small project, but I cannot spend a lot of money. I have heard others discuss an affordable technical writing service, and now I am wondering what I should expect. Is it possible to get accurate and easy-to-read technical content without paying a high price? What would you check before choosing any writing support?

I only started writing content recently, and I feel there is still so much to learn. Some people I know have talked about pay someone to write website content when deadlines become stressful, but I want to avoid common mistakes first. In your opinion, what is the biggest mistake beginners make when writing content, and how can it be avoided?