To follow on to SD's post (I should have been clearer), I usually put the mobo on it's antistatic bag, then on the foam pad that will be in the box and all that in the actual box whilst adding things before installing it in the case. Of course, you will be doing all this on a table of some kind so that means you have a nice, flat, stable platform to work on.
TBH, E.Z., I have never used antistatic gloves/straps/etc and I've never had an issue. Just make sure you hold any components at the edges, with as little contact as possible (think of holding a CD, you hold it so your fingers are on the very edges so you don't touch stick a fingerprint on the bit the disc is read from. Treat components in the same way.), don't touch any parts on the component and keep fingers clear of the connections. In an ideal world the power supply will be in the case as you work so you can connect the power cable, plug it into the wall (DO NOT SWITCH POWER ON AT WALL!!) and then the whole case is earthed so as long as a part of your hand/arm (big toe if your a contortionist) is then touching the case there shouldn't be any chance of any sort of issue as you and the PC will be at the same "potential". And there's always plenty exposed metalwork in a PC case to do that with.