I've used the method on the link Rustle posted - for the last ten years at least. It works brilliantly.
if you're only going to fly in a certain small area, then it makes sense to fold the chart so that it displays that bit. if you go further, you need to be able to refold the chart quickly, accurately, and expertly.
M and I just flew off the bottom right hand corner of the Southern UK chart, then right across the French North West chart (and nearly off the bottom left hand end of that). The "link" method worked perfectly all the way there and back. I had the chart on my lap, and knew where I was all the time.
That method came from Duncan McKillop, and I reckon is one of the most useful little tips I've picked up as I've bungled my way around Europe...