I need help with a kitten!

So I'm wanting to adopt a kitten maybe around 11 weeks or so and I've had a cat before but I've never raised him alone he was always a family cat. He passed away in February which is why I'm getting a new cat but the only issue is I'm having second thoughts...One main reason is my bedroom is small and I'm worried about the kitten not having enough room to play around and not to mention everything I need for it is expensive. I don't really like change and to make room for everything I'd have to get rid of alot of stuff and cat proof everything PLUS even after getting rid of things I still wouldn't have alot of room...Please help me!!