I have built several PCs now. They have all gone well. Though I must admit I have always brought more parts a few weeks later. Normaly fans and other accessories rather than core components.
The last PC I built did not go quite according to plan. I built a system around an Intel Prescott CPU. However I forgot to do some research and it did not occur to me that Prescotts run a little hotter than other CPUs. They require a case which can maintain a lower ambient tempreture than normal. However once I swapped the case around for a 'cooler' model - an Aluminium one with more fans - I got the Prescott under control.
So I guess things were a little shakey at first, but once I got some information from Intel about how hot I could let the chip run, and take the right measures things improved. I must also say that Intel were very quick to give a response to my question, which is good because there seems to be a lot of confusion on the net as to how hot a Prescott can, or should run.
I think that had I done more research in the first place as to the components I was using then I would not have run into any trouble. But I guess I have learnt my lesson now, well untill next time.