1. Make sure your avadoes are ripe before cutting into them. The skin should darken as they ripen and when you press into the avacado it should give slightly. You don't want it to be mushy soft. If you need to ripen your avacadoes quickly, put them in a brown paper bag for a day or two until they ripen.
From What's Cooking America
"To remove the seed from your knife, pinch the seed by placing your fingers over the knife blade (blunt side) and squeeze as though you are pinching the end of the avocado. It should pop off from the knife and fall freely."