This is something I could be interested in, as I always feel like the passage ways are bunged up.
Looking at the picturs on the box, just how much self control do you have to have to get the stuff to where you need it, to clear out the nasal cavities?
It's easy. It's a bit strange at first but you'll find your way and make it work. This is what works for me:
Boil kettle, pour water into a mug and allow to cool to room temp.
Pour water into bottle and add sachet of saline.
Finger over hole in nose cap and give it a little shake to ensure it's proper mixed (not really necessary as it mixes very well, but I like to be sure).
Lean over sink, place nose cap in nostril and squirt.
KEEP YOUR MOUTH OPEN (sorry, but that is of paramount importance), allow water to drain out of other barrel. Give it a little blow and repeat other side. That's the basic method, works well for hay fever sufferers to wash the pollen out of your hooter.
What I do (surgeon's advice) is snort the water up as you squirt (i.e. suck the water up with your nose like your snorting coke) and that gets it right up into your upper sinus chambers. Then, block one barrel with your finger and blow out of the other; it works best when snorting up one barrel and blowing out of the other). What comes out will amaze and nauseate you at the same time.
Repeat on opposite side.
Another tip he gave me, after snorting the saline up hold the water up there, pinch your nostrils and bend right over with your head on your knees and gently shake your head around. This ensures saline gets a good swash around your head and upper chambers. Lean back over sink, and blow as above.
On completion, just bend over your toilet and tilt your head from side to side to allow the residual water to drain. I say toilet because it needs to be something low; your sink will be too high and you won't be able to bend far enough over (unless you stand on a box).
Do not, ever, under any circumstances, be tempted to do this with just water. I forgot my sachet of saline once and inadvertently made the mistake. It burns like fuck! So don't.