Remember to focus on short steps. Its instinct to try and hit full stride from the first step but there are very few guys around who are powerful enough in the legs to pull that off (Or who have short enough legs in Jason Robinsons case). 

Stay calm when the ball comes your way and tell yourself to keep your paces short until you are fully wound up. This won't make your top end pace any faster but you will take off quicker and hit top speed earlier. Rugbys more about acceleration that top end pace in most cases anyway.