So my dad couldn't buy it in India, the store he went to didn't have it yet

Looks like my best option is handtec.co.uk. I'm a little bit worried about ordering the phone like this, I've never ordered anything expensive from an overseas store before. So I have a few questions if anyone could answer these for me.
If there are any problems, can I rely on Handtec to sort it out? Is there service good and will they replace the phone if it's faulty or goes missing on the way here?
Also, since the charger will no doubt come with a UK plug, should I just buy a UK to SA adapter, or can I buy a compatible Samsung charger locally? Or is the charger designed in a way that I can easily cut off the UK plug and attach a South African plug? I have a few 3-pin SA plugs that I could replace it with if the design allows for it.
I suppose the phone charges over the USB cable so I can charge it from a PC in the meantime?
And lastly, are there any other costs that might come up from customs or something?
I want it so bad, I already download the Android SDK so I can develop apps for it