Right guys I am really strugglin with this and a bit embarrased to ask really. Neway I have spent over 2 hrs today trying to get my front passenger wheel off

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Yesterday I noticed that my tire was a little flat so this morning took a look at it and found a nail had stuck in the tire. Right I thought, simply get the spare out the boot and change it. That is about as far as I got. Took of each of the five nuts and tried pulling the wheel off but it wouldn't give. I then looked under the VW cap in the centre of the alloy and it looks liked it is screwed on tight. So off I went to halfrauds to buy an adapter to try and unscrew this area. When I got back found out that I don't have the correct ratchet thingie to get it far enough away from the alloy to unscrew and now all the shops are closed.
It is going in for a service 2m so I will just ask them to do it then but was wondering if this is the way all the wheels are changed and how on earth do I do it myself?
Thanx guys