Its all very easy, just fill in your details on line, including the date you wish the visa to start from, pay with a credit or debit card, it will cost you around £13, some credit cards charge approx. £1.50 for processing in another currency. The e-visa can easily be downloaded and printed off. I would suggest you print off a couple of spares in case one gets lost. I am not very good at computers but it was very easy. Good luck