I found it fine. I had a Sphynx kitten (at the same time as a 6mo old DD lol). They're a very high energy breed, but it was still fine. I'd recommend 12 weeks instead of 8 as they are a bit sturdier by then. We had one kitten proof room at the start, and would only let him roam in company, but after around a month, he had free range of the house.
I would get two, as they will play with each other. The main thing is they need somewhere safe where they can't get into too much trouble, and they need plenty of stimulation. But they also sleep a lot!
Don't get me wrong, my Sphynx was an absolute menace, constantly committing crimes, but think that must just be his personality, as he's no different as an adult when he's hungry/playful 😁 And he's very entertaining. He just needs a lot of play! But equally he's my best bud, sleeps under the duvet with me, and follows me everywhere.
If you cycle through a lot of toys, tire them out, and give them plenty of interaction, they will be fine. Like adult cats, they'll still sleep a lot of the day!