I think I got a bit over-zealous with the project, and I can't put a lot of money into this because I don't have it 
. I'm definitely not giving up on this, but I'm just setting my expectations a bit lower until I have a bigger budget and a better understanding of electrics. Thank you guys for all the advice and help, I really appreciate it!
Good point.
Switching power supplies generally just kick out when overloaded (or shorted). No fuse needed for that part.
WS2812B LEDs do not have current limiting resistors on the strips. I don't know exactly how the current is regulated other than that it's all done on board. Those strips do tend to get pretty warm indeed!
OP: there are strips with different numbers of LEDs per meter. The lowest is 30, giving you 450 LEDs. That'll be more than enough to light up a bedroom, even a living room. Add diffusers for nicer light distribution. Your suggested number of 900 LEDs suggests you're looking at the 60 LED/m version.
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