I love my neti pot. I recently got a 16 oz stainless steel one (look on Amazon or Google) . I used to have to set my machine above 10 at times to blow through the congestion now I manage at 6 or so (I use a nasalaire II) . Used to be that sometimes the air blowing through all night would leave my nasal passages irritated and a runny nose all day. But now a nice rinse sooths them.
Warning- many would say that one should get personal instruction from an expert for what is above and what follows. I've never met one but use your own judgement! I like the instructions here:
http://www.jalanetipot.com/method.html for what they call stage one ... but see what works for you
I use about 1.5 tsp UNIDODIZED salt and 0.5 tsp baking soda for 16 oz. As much as I might carefully blow with a tissue (when congested) I can be sure that the irrigation will dislodge 1-3 pinkie size globs of snot (well that is what it seems like) Actually I skip the tissue and avoid the red nose.
It is essential (in my experience ) to take the time to dry out the passages by bending over head down for a while, exhalling steadly, then some sharper blasts being careful not to blow hard enough to pop your ears.
Then repeat standing up.
For the in the nose out the mouth technique ( Which I only do if I really feel the need and which really requires thorough drying afterwards) I first do the in one nostril out the other . Then I start over but once a good flow is going I inhale more or less vigorously, sometimes removing the pot and just gurgling for a while. It takes paractice not to gag but you won't swallow it.
Well enough on that for now. One can find various instructions online, use your judgement. Some places say that you should be bent forward at 90 degrees. It keeps my shirt dry but I usual am content to stand straight up.
There is supposed to be a "level three" where the water is taken in the mouth and passed out the nose. I've not figured that out myself.
I'll close by saying that I was a constant mouth breather for 50 years. Now with a pot or two in the AM and another at night I am a happy nose breather.
good luck!