i would start by setting the boost low until you start to get used to it, and then gradually increase it as you feel that you can handle it. during that time, an airfield or other track day is a good idea, especially with a bit of tuition.

my mate did one at north weald airfiled off the m11 near stansted and reckoned it was well worth it. bit far from you, but there'll be similar things closer i guess.

http://www.carlimits.com/