The easiest way to slip yarn through stitches is using a blunt-tip needle, or tapestry needle. Something with big eye. You can use a crochet hook in a pinch, too.
When a pattern says to 'reverse shaping,' it means that you're going to make a mirror image of the first one. So if in the first ear you decreased at the beginning of the row, do it at the end, and so forth.
The easiest way is to just do the increases and decreases with the wrong side facing you if you did it previously with the right side facing.
Once you get the first ear done, if you're still confused, come back.