When it comes to snorting any drug it is all about line size. You want pencil thin lines. Not those fat ass lines you see on TV or in the movies. The next big thing is you need to find just the right amount of force to inhale with. Too much and most of the substance does not get caught by the mucus membrane where it is supposed to be absorbed.
The best trick I've found to figure this out is to practice this without any substance. Slightly open your mouth, put your tongue on the roof of your mouth and start to inhale through your nose. You should feel a small amount of air actually flowing through your mouth. Once you've figured this out, then onto racking up your lines. Remember, multiple thinner lines over your session is wayyyy better than a couple fat ones. When it comes time to do the deed, I would recommend actually still having your mouth open when snorting. Remember you want it to stay in your nose. Eventually, you'll get some drip.