Its very simple to assemble your own PC if you have all the devices ready with you cabinet, motherboard , power supply, hard disk , etc. just fix them into the cabinet and connect all the cables then install the CPU in the socket very carefully without bending any pins and clip up the CPU socket and attach the CPU fan very tightly if its loose it want provide proper cooling to the processor and these may damage your processor and install all your other devices like RAM in the memory slot and install your hard drive and DVD drive and connect to their ports. Attach the small wires to the power button and reset button and even the LED wires of power and the hard disk LED wire and connect all the power supply cable to all the devices like hard drive, motherboard, etc and you can start your system and install the operating system and other application.