Have you ever played with Lego and can you read?
If yes, then you can build a computer.
Suspect that being a mechanic is harder than building a computer.
Heres a couple of good tutorials I learnt from.
NCIX Build Guide.http://www.youtube.com/watch?v=HIJx6Y3tofg
Newegg Build Guide part 2 (Part 3 is installing Windows, drivers and such. Worth watching)http://www.youtube.com/watch?v=d_56kyib-Ls&feature=relmfu
And a Cable Management guide, this is also worth watching and doing. Fully expect to get nowhere neat as him behind the mobo tray, I have invested 2+ hours into cable management and its is nowhere near as good. Linus is just some kind of genius with this stuff.http://www.youtube.com/watch?v=ERhxmzQR6xA&feature=fvwrel