put the chip/hsf on the mobo before mounting if you can.. otherwise that can be a real pain in the rear
otherwise its very straightforward.. I just put my signature system together a few months ago and had never done it before.. it is a little scary since YOU are the warranty on it not booting etc at first!
Work on gettin cpu/hsf/ram into the board, mount board, install psu (or do this first like i did), install wires to mobo, install gfx, install HDD and attach, install dvd drives and attach, plug it all in, turn it on.. dont bother putting your covers back on etc until you're sure you're done.. i just put mine on this week since I was waiting on fans
As for thermal paste.. people say use a pea as a guide.. but use less than that to avoid it squishing out the sides.. hard to explain, but hte size of a spitball (usually thats smaller than a pea) would be my guess.. this was also the part where i went.. what the h*** am I doing!
once its all put together, boot up, go into bios, set ram to your mem specs manually, dont use XMP profiles etc, set mem volts to 1.65 or closest (mine does 1.64 in bios)
install windows, try to get solid starting boot, download prime95/coretemp or realtemp/memtest
run memtest off bootable cd or usb (need to setup primary startup in bios to not use HDD)
if memtest passes, get back into windows, run prime95 for about an hour and use coretemp/realtemp to monitor your temps.. at stock you shouldn't see that go over 70c unless your ambient is up there.
if p95 passes an hour stable (hopefully it does at stock settings) go back into bios and start tweaking, the chip OC i'd step down to someone on a asus board since its a little different and im not very good at oc'ing yet.. but up cpu voltage to like 1.25 and try setting clock to a 161 and see if you can get a boot into windows.. if you do run prime another hour and watch temps.. if that works, wash, rinse, and repeat though you will need more voltage adjustments for higher ocs..
also what stepping is the chip c0 or d0?