I frequently enter competitions online and I have Google toolbar installed which you can use to autofill. I also have Roboform installed, which as well as being a great password manager it can also be used to fill in forms.
Roboform Downloand. Google autofill sometimes does not fill in the complete form so using them together means that almost all the time it saves you time. Roboform will also fill in details such as your date of birth instantly.
If you do download or have them already installed on your computer this tip could also be useful.
When you come to enter your details into each of the autofill forms enter your house number on the first line of the address and your street name in the second line of the address.
Therefore your details would be for instance
212
Arcacia Avenue.
Sites such as Webuser have a seperate box set up for house number and another one set up for street name.
Therefore your details are automatically entered into the correct boxes.