I have no doubt you will do just fine. My DIY clients found the Loba easy to work with once they understood some of the 'rules'. Some of my best applications came from homeowners willing to learn the rules and READ the instructions. The Loba is a "shaken not stirred" type of product. It has ANTI-FROTHING products added to it...that's why it has such a hefty price tag! You will shake BOTH containers for 60 seconds. Then you will mix the two products (into a third container...like a measuring cup - l like one's with milliters listed because it makes the 10:1 measurements STUPID easy ;-). Once the two are mixed, you can shake them for another 60 seconds (or a VERY good stir for 1-2 minutes). You are ready to go. You will see bubbles but you will IGNORE the bubbles. Yep. I said ignore. The Loba is "self correcting and self leveling". That is to say, the BUBBLES will disappear BEFORE the finish cures (you won't see them later on) and the areas with a little bit MORE finish (like a little wake line from time to time) will level itself out. Again it will not be seen once it drys. That's why Loba is relatively easy to use. Once it is mixed you simply apply it and walk away. It gives a lovely flawless finish regardless of your level of skill (it can hide a lot).

I had the same situation in my former home/new build. I painted the stairs (I always paint risers white and treads an accent color) and did a runner up and over top step and across the loft floor. I had posts, as do you, and I used tempered glass instead of railings because I wanted to see the living room below. All around the perimeter of the room, my builder laid the same hardwood as the floor below…in my case it was Hickory/saddle stain. So have the posts ON the hardwood, not just at the edge, as in your photo. Not my loft, but this idea:

There is only one way to fix this and that is to fully carpet the upper stairs keeping to the left where my arrow is to show where you step juts out as well as to the right where again my arrow is where again your stair juts to the right. Follow these lines to the bottom which is centered between your posts. If the carpet store was out to measure this and do the layout they would have noticed this HOPEFULLY. If you did the measuring and ordering then you are stuck with a partial redo as this is the proper way to carpet these stairs. My image is crude but you get the idea.

many diff ways to do it. I'd prob paint the risers instead of a laminate. this looks pretty good take a look at the pics maybe some of the videos will help you decide https://tilen.space/can-you-install-vinyl-flooring-on-stairs/ notice the finished sides on this one. https://www.youtube.com/watch?v=2RUvl1yPUCA https://www.youtube.com/watch?v=AI1poE8dn10