Like I said above, I'm predicted an A at Higher and I got an A1 (97%) at Nat 5.
I would like to say that I'm definitely a humanities person, so how I feel about history is very different to how you might feel if you're STEM inclined.
There's two papers at higher. Paper 1 is the essay paper, and in the exam you answer one essay on a British topic and one essay on a world topic. You get a choice of three essays per topic in the exam, so in order to be able to answer at least one of them, you'll learn at least 4 essays per topic/8 essays overall.
The essays are probably the most difficult part of Higher History (at least to begin with) because they're new. It is much easier if you listen to and follow your teacher's instructions and take on board any feedback you get. I've found that in my class, those of us who have broken down specifically how to get each mark have been doing much better in our essays. I wouldn't say I find the essays difficult (I did a bit at first because it was new, but definitely not anymore). The time-consuming thing for me with the essays is figuring out where I'm allocating each mark. You have 5 factor paragraphs, and you need to mention all 5 in your essay, and so it would be impossible to try and gain each type of mark in every paragraph. There's a maximum of 6 knowledge marks, 3 analysis marks, 3 analysis + marks, 2 evaluation marks, and 2 evaluation + marks. You can't do all of them in every paragraph, so I just do the minimum I need to overall to get all of the marks (e.g., K, A, & A+ in one paragraph, and then K, A+, K, & E in the next).
Paper 2 is on a Scotland topic and in it you do skills questions like at Nat 5. The skills questions themselves I'd say aren't difficult at all because there's less of them than at Nat 5, and they're just worth more marks each. I think it's easier to wrap your head around than the essays because the structure/how you get the marks is a bit more simple.
Overall, I don't feel that the content is any harder or more complex than at Nat 5, it's just that there's more of it. You do go through the course much quicker because there's more of it to learn and you've only got a year.
I think that if you're good at/like humanities subjects and you're the kind of person who puts in effort, you won't struggle too much. If you're naturally more STEM inclined then you might struggle (and hate the essays), but it wouldn't be impossible to do well either.
I hope this helps, and if you have any more questions, feel free to ask me. 😊