Prescient and pertinent advice for those in the US and some other countries, but OP in this case is in the UK, where e-cigs have been regulated fairly heavily in certain aspects but will not be pushed out of existence as in the US. For now. In fact, last I heard, the UK government was considering officially adding e-cigs to the list of smoking cessation tools.
Never a bad idea to learn how to DIY as much of your e-cig gear as possible, though, especially consumables.