Hatching brine shrimp is quite easy. I have a couple of 2 litre soft drink bottles . I drilled a hole in the lids , put airline thru and put airstones on the end of the airline.
I find I get a far better hatch rate with sea water - I change the water about every two weeks.
Bought the eggs off TM- much cheaper than LFS.
Every 2nd day I drain one of the bottles.
If you keep them warmer they will hatch faster but at room temp thats how long mine take.
Take the airstone out for a few minutes to let the unhatched eggs settle on the surface then siphon out thru a piece of cloth.
Scrape the shrimp off the cloth and either feed straight out or put into a shot glass of water and feed out with a pipette.
If I'm in a hurry I won't siphon- just pour straight thru the cloth. You get more unhatched eggs this way but if you scrape them off the cloth into the shot glass the unhatched eggs will float to the surface and you can pipette the hatched ones from bottom.
Rinse the bottle ,add back the sea water and more eggs.