Gather all parts and tools
Ground yourself to prevent static discharge
Install the CPU on the motherboard
Install the CPU cooler
Install the RAM
Install the M.2 SSD if applicable
Prepare the case
Install the motherboard standoffs
Install the motherboard into the case
Install the power supply
Connect the motherboard power cables
Connect the CPU power cable
Install the graphics card if applicable
Connect PCIe power cables to the graphics card if needed
Install SATA drives if applicable
Connect SATA data and power cables if needed
Connect case fans
Connect front panel cables
Connect USB and audio front panel cables
Check all cable connections
Manage and route cables
Close the case panels
Connect monitor, keyboard, and mouse
Plug in the power cable
Turn on the PC
Enter BIOS or UEFI
Verify hardware is detected
Set boot order
Install the operating system
Install motherboard, GPU, and other drivers
Update the operating system
Test system stability and temperatures