haha i know that sounds scare if you have no idea about topping... but when you top it, the 2 branches closest to the cut become the new tops. where you cut seals itself, and stops growing, and it makes your plant start growing outwards as fast as its growing up. some say it makes more yield, some say it doesnt. just preference. wont hurt it, but i would let it veg for at least 2 more weeks to let it get used to diverting energy different directions.