Hopeful....don't worry about knowing how to sew on a button. You will be an expert sewer (is that even a word?? LOL), by the end of Indoc.
Also, you'll learn all about the funky way the Navy likes their uniforms pressed, so it's a good thing you now how to operate an iron. You may want to learn how to use spray starch too....and Brasso....learn about brasso