easy mate, get yourself over to
www.wraysburytyres.co.uk in Chertsey and buy one of Steves plug kits, he will even run through how to use it with you plus he is a top fella .... I've had tyres plugged and its not an issue .... we took one of Steves kits to France on our recent trip but luckily didn't need it ....
If you are happy to just read the instructions than Steve will post you one out.