I NEVER said the motherboard goes in first.
You will always find that people have a different way of building their computers.
From the second guide Link I sent you
The power supply is usually easiest to install prior to motherboard installation. It's typically held in place with four coarsely-threaded screws.
and as I said, if it slips as you go to put it in after the motherboard, it may well be expensive.
However as I said people have their own way of building systems
and in relation to the spilling of the coffee or whatever - as you have said
Hehe no I won't be putting any cups of tea or coffee anywhere near my precious baby I've never destroyed anything by spilling on it, but I won't start now : p
that is one less concern for you.
In respect of the placing of the component on its anti-static wrapping. It is many years since I have seen a computer component in a anti-static bag that was metallised on the outside.
This is from just one of the systems I have recently built and is from an ECS motherboard
Here is another example
Take the new RAM modules out of their static-free envelope and place them on top of the envelope[/u]. Always hold a RAM module by pinching the edges of the module; avoid touching the chips or circuitry on the face]
HOWEVER just in case you are purchasing a component that is supplied in an anti-static wrapper that is metallised reflective on the outisde, then just to be certain place it on cardboard, or in the case of the motherboard, the foam that it was resting on inside the bag.
NOT on the carpet.
In relation to breadboarding or barebones - post 35 onwards on the link I sent from this site`s how to build your own computer.
My advice - as it is your first build - READ the links. - that is, although you may not think so now - the BEST advice.
If you do all should go well, but you will not be the first, and certainly not the last to make an expensive error.
Also ASRocks motherboard manuals are quite good so I suggest you read that two or three times, checking out each important part, especially the connection of the
various headers and one of the first jobs the stand-offs and I/O plate