The Welsh side scored seven tries in their 55-20 victory as they romped to a second European semi-final in two seasons following their run to the last four of last year's Heineken Cup. They will now travel to face Wasps.
"We have scored 88 points in the last two away games and that is a good thing in anybody's book, but we are keeping our feet on the ground," said Young.
"Things went for us, I think the odd bounce of the ball went our way but we did play well.
"But we have got a huge (Magners League) game against the Scarlets coming up. It's a do-or-die game for them and it's hugely important for us as well.
"If we win we will secure our Heineken Cup spot and I am sure the Scarlets will be very up for this fixture."