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Tomatillos can quickly go from being ripe to splitting their skins, and are over-ripe if they have turned a pale yellow. Fully ripe tomatillos are usually 1 to 2 inches in diameter, with a tangy to sweet flavor. Under-ripe tomatillos do not fill the paper husk, may appear slightly shriveled and taste somewhat sour.
If you can't find any perfectly ripe avocados, you can get one that's not ripe yet. It'll ripen at room temperature in a few days. You can use it as soon as it ripens, or keep in it the fridge once it's ripe. If you're planning on making guacamole dip, it's a good idea to get your avocados ahead of time. ripe avocado is firm, but if you press it, it'll yield just a bit. If the avocado is very hard, it's not ripe. If the avocado is squishy when you press it, or it feels like there's space between the peel and the flesh, the avocado is too ripe. The skin on a ripe avocado peels off really easily.