Next, we want to find the most comfortable angle of approach for the line you've planned out - so feel free to rotate the page as needed. Personally, being right handed, I find that the most comfortable angle for me is drawing from left to right and away from my body at a roughly 45° angle.
I do get a lot of students who fight against this and insist on trying to draw lines at any angle. It's admirable, but it very much gets in the way of things. To be blunt, that's not where we're going to be spending our energy. We're going to focus instead on really nailing one line, drawn from the shoulder, from one angle of approach. We're going to focus on making it confident, smooth and accurate.
The thing is, the actual range of lines you can draw comfortably will expand naturally as you continue to practice, simply because as human beings, we are lazy creatures. That laziness means rotating the page is kind of annoying, and so if the line we want to draw is only off from our "range of comfort" by a bit, we'll probably just go for it anyway if we're not forcing ourselves. And so, bit by bit, that range expands.
That's not permission to be lazy, mind you - I expect you to rotate that page for each and every line, to apply every step of the ghosting method from here on in, so long as you're doing work for the Drawabox lessons. Outside of that however is no longer my jurisdiction, and you're free to do whatever you like.