It didn't take much for my sinuses to feel stuffed up at first. I'd imagine everyone will react a little different, but it didn't take too long for things to settle for me. I think my technique has also improved. I prefer to pinch some in my fingertips, from the Silver Dollar tins I tap a bit on the back of my hand first and from the others just pinch straight from the open tin. Once I have a good pinch, place my fingers just so my nails can catch the edge of my nostril and breath in normally as I "roll" the pinch open slowly. This exposes the powder and slightly flares the nostril. Switch nostrils and repeat. If needed I can close off the opposite nostril. I've really gotten to the point where my inhale has pretty much no more force than an average relaxed breath, maybe a touch more as needed. I'm still fine tuning my coordination a little, but if you pinch between your thumb and middle finger you can use your pointer and ring fingers as appropriate for opposing nostril blockage.