[ubuntu] Custom gaming PC questions?

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http://ubuntuforums.org – Hello, lately I've been considering buying parts online and constructing my own Gaming pc. So far these are the parts i have in mind. http://pcpartpicker.com/p/26l7 I just have a couple of questions regarding the whole build. 1) How hard is it to construct it from just the basic components (hardware) having no experience, and only knowledge acquired from videos online. 2)To reduce a bottlenecking effect, can I buy a cheaper CPU and overclock it, and buy a more expensive GPU to match the performance, thus reducing the bottlenecking effect? I.e. buying $300 intel i7 2600k, and overcloc (Hardware)