Look at the link that murraymints suggested and then give it a try; you have nothing to lose only your time. You can fill-in the form online, saving it as you go along, so you can take as long as you like over it. If you get really stuck you can then resort to legal help but, the chances are, you'll be able to do it. Only when you've got it all done do you have to send it away with a payment to get it authorised, so trying to do it yourself is totally free.