Congrats on the new addition. Like anything else, you need to adjust if you are this concerned. The slippery floors can be helped by adding carpets. We bought a Ruggable and it's been great. Every now and then one of ours has a little tinkle accident and it's awesome to just throw the whole rug into the washer. Stairs are a little trickier. but there are carpets as well. Eventually, slips like that with an older animal can be of great concern. Our dogs have adjusted to the stairs easily, but I fear in a few years we might have to limit them to being downstairs due to their age.
Personally, I wouldn't have knives exposed like that. Our cats would roam the kitchen, but we had our knives in blocks. Our cats never went near the stovetops when they were hot, but there are covers for this.
As for the shelves, cats find their way onto most surfaces. It all depends on the personality of your cat, some are less adventurous than others. I don't think there is a way prevent cats from trying to jump onto things, but bookcases with doors would be my way to go. I didn't start with shelving until my cat was much older, so I wouldn't know.