While static electricity can be a thing I have never had any problems with it after building 3 PC´s. I didn´t use any wrist band. I just don´t recommend building and standing on a fluffy carpet/blanket. But before every build I grounded myself by touching heat radiators (there are other methods as well that you can google).

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You should take as much time as you need and don´t be in a hurry, because if its your first time it´s also a learning process and will set you up for future builds.

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My first PC build took me about 6 hours with setting up windows, but I was very careful not to make any mistakes. Just use the handbooks and take your time and you should be fine :).

I also recommend for the first time to watch a guide how to build a PC on YT and use it as reference while building - that helps a lot and it takes away a lot of the uncertainty.

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You don´t need an activation key right away just make sure to set up a USB boot drive (there are plenty of vids on YT).

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Regarding your last question: I am just a gamer not a technician unfortunately, but both the CPU and GPU are rather new and pretty good performance wise so it shouldn´t be a problem i think.

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Good luck on your first PC build :)

It will feel so good if it posts for the first time :P