To buy in UK, overclockers.co.uk, ebuyer.co.uk and dabs.co.uk and a few you can try.
UK sucks .
Anyways as for installing stuff, it's fairly simple, rule 1, do everything when the PC is OFF and Unplugged . Most things just plug into stuff =p, so if you are lame and ask someone to install for you make sure he does not overcharge you .
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. Most things just plug into stuff =p, so if you are lame and ask someone to install for you make sure he does not overcharge you 
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