Ok heres what i think. For starters dont worry about having somebody else computer. Use your own so ppl on here can trust you because you trust yourself messing w/ your own parts. Taking a HD out, hitting record, and putting it back in will not harm it nor will you not need anyhting new. I say do it for these thing cause they are the most common asked.
Install CPU
Install RAM
Install HSF for cpu
Install Mobo
Install PCI cards (IE sound card)
Install extra fans (80mm 120mm blah)
Install fan grills
Install Windows and how to format a HD
Install a window kit (if you think you can do that, its tricky and advanced)
Install LEDs or a cold cathode.
Install a network on a Hub, crossover cable, and a server.
How to share an internet connection.
Did i forget anything?
Install PSU
Install HD/ CD-ROm