Is writing in the third person more difficult than writing in first person? Depends on what you’re talking about.
Third person narratives can be more wide-ranging than first person. They can show more people, more events, more everything. But, at the same time they can seem more distant and, therefore, less interesting.
First person is immediate, personal, immersive, so the reader can almost crawl inside the narrator’s mind. But, because they ONLY see the story through that one character, the story that’s told is limited to what that character sees, hears, etc.
Both have their up-sides and their down-sides. The writer should think about the story they wish to tell and decide which narrator works best.