In addition to everything everyone else said, my recommendation is to pay some careful attention to the routing of the various wires and cables inside your case. Having a rat's nest of wires makes for cranky moments when servicing it, and can also obstruct air flow through the case, making your interior hotter than it needs to be.
Also, 'Don't Panic' if something goes wrong. You can cause more damage with a hasty 'repair' than sitting back and thinking about it for a bit.
Good luck.
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"Act as if the future of the universe depends on what you do, while laughing at yourself for thinking that your actions make any difference."
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