Potty training is hard only if you are inconsistent and don't know what you are doing
SO do a little searchign on here if you are unsure. There are many threads about it in the puppy section.
Also, it shouldn't confuse the dog, or at least it didn't Titan. They are very smart. They will learn that when you are in the other part of the house.. that's their "bed" and when you are in your room, that's their "bed."
Because you seem to have a large space for her to roam, just make sure you are with her 100% of the time. She should never be left unattended, and if that needs to happen, then in the crate she goes
Also more clarification with the stairs. It is my opinion, based on my own research that as long as there isn't heavy impact on their joints as puppies, you are fine. That was why I said to carry her for the first few months until she is older, then teach her to just walk up and down them.. not jumping. Does that make sense? Sometimes it's just not possible to avoid stairs in some of our living situations so I found as long as we limit the impact, it's doable.