Teacher Darya from YouTube tried describing the ы sound as such: try to make an 'oooo' sound, so with this you start with a pucker on your lips, right? Slowly turn the pucker into a wide grin while still makinh the sound. The end result should be how ы sound like.
Another is taking the 'i' sound in the word 'miss', then pronounce it with the tongue pulled back flat on the floor of your mouth.
The following link will take you to forvo.com, where you can hear native speakers say each word. If you use a PC, when you get to the page, hover the cursor over the world, then select "open link in new tab", which will present a page with all the listed recordings of each word as spoken by different people. From what I hear at forvo, the computer voice is not accurate at all.