This is a nit on one of my hairs on a cotton wool disk. As you can see they are tiny! Nits are practically invisible to the naked eye. A magnifiying glass would definitely come in handy to be able to see them.
You also need a special comb to get rid of the nits and eggs which are glued to the hair shaft. And, of course, you are gonna need a lot of patience to comb your hair thoroughly!