First, you will need to purchase a Neti Pot. A google search will turn up hundreds of vendors of Neti Pots. An unbreakable pot with a smoothly tapered spout tends to be more comfortable.
At the first sign of pollen, you need to begin using the Neti Pot.
Not mix a saline solution. Use 1/4 teaspoon of salt to 8 ounces of lukewarm water. Pour into pot.
While standing over the sink, tilt your head at a 45 degree angle. Place the spout into the higher nostril. Gradually lift the neti pot handle and begin pouring one half of the solution into the higher nostril. The solution will drain out of the lower nostril. Repeat in the other nostril.
When finished gently blow your nose.
Perform a Neti Pot irrigation once a day.