They are VERY easy once you get it right.. just shape your mouth like you're going to whistle, with smoke in your mouth blow a little out pushing it with your toungue a bit. It's pretty fun, But sometimes can ruin smoking time if you're practicing with weed... try it with cigarettes ir cigars.. when you have weed, it's best to do stuff like french inhale and blowing it out of your nose... get you nice and toasty and you can taste the yummy taste of that fruity grass... unless you're smoking mids or reggs.. idk I always smoke that lime green