A tip I tend to use when on the wing (Or 13, though it tends not to work from inside centre) is to shoot up fairly early on and look for the interception to put it in the oppositon fly-half's mind that you can and may well do that if he sends out risky passes, although it's best not to do this unless you otherwise have cover. While it came off last week (I got a try on our team's first touch of the ball) on Sunday I didn't make sure we did cover and the 10 ran himself, opening up a gap which was thankfully snuffed out in the end, but it's a useful tip nonetheless.

Oh, and really milk the fact you're going for it. Strech and arm right out, even if you're going to miss the ball. It's psycological. It takes a lot of preassure off yourself and getting into a positon to cover one-on-ones, overlaps and chips.