I still struggle with making the perfect flick on the days that I chose to do eyeliner, but it has become less of a task since discovering this product. A couple of tips that I've picked up: use an angled brush with some eyeshadow to stamp out the flick before going in with your liquid/felt tip liner; always keep cotton buds and concealer on hand. If you really struggle with getting both sides even, then try the business card trick - hold up a card to the side of your eye, lining it where you want your flick to be and then just trace along the edge. You could also use tape, but remember to de-stick it on the back of your hand a couple of times before taping it to the eye area. 

What are your tips and tricks to getting the perfect flick?