The same day I bought the celery, I also bought these nice avocados. If you gently squeeze an avocado, when it starts to feel soft, not hard, then it is ripe and can be used. I bought them quite hard, all except one to use right away, and waited for them to ripen:
I only shop for groceries about once every 2 months, and so having fresh avocados is rare, and if I buy more than 2 they might be wasted. I read about this on the internet quite some time ago - I don't remember where. Now, when I find a good price on them, I buy several and here is how I process them.
First, cut one in half and hit the pit with the knife. The knife will stick into it and then you can twist the pit out easily:
I use a spoon to scoop the flesh from the avocado and put them into the food processor. Then, for each 3 avocados, I add 2 Tablespoons of bottled lemon juice. Of course, you could use fresh, but I rarely have fresh lemons.
Next, process it all until smooth. I place a little sandwich bag into a drinking glass and add 1/2 cup of the avocado/lemon mixture. The glass helps hold the bag open and reduces mess.
Here is a bag with the 1/2 cup in it:
And here is a freezer bag stuffed full of the little bags:
This went into the freezer and when I want to make guacamole or have avocado dip, I just pull one out and let it thaw in the refrigerator. The lemon juice prevents darkening.