If you want to be efficient with time, I have some suggestions that some people won't think about.
Unless you're booting your OS through a CD drive, prepare the USB OS install prior to building your PC.
-During your build, think careful about every single detail such as the placement of your cables and components.
The placement of your cables are critical for several reasons:
If you want to replace or remove a component, it is a lot of hassle and tedious work if the cables are tangled and intertwined; moreover, if you want maximum efficiency in airflow and heat dissipation from your case, then cable manage will slightly help.
-Make sure your PSU is turned off before you plug it up with your components.
My buddy electrocuted himself and fried his components in the process..
-Use CoreTemp and monitor your temps after you updated windows and installed basic programs such as browsers and etc.
Use a temperature monitoring program and make sure that your heat sink is properly doing its job. CoreTemp is free and safe.
-Do not use the driver on the CD that came with your GPU.
Unless you purchase the GPU at launch, more than likely the drivers will create unnecessary errors with your GPU. Generally, it is better to manually download and install the drivers from the website.
-Try to run your PC for 24 hours after you installed all the necessities, checked for abnormalities, and stress tested your rig.
I only recommend this because it allows you to see if there may be any problems that are lurking in the shadows.