Do not remove or insert the lenses without first washing your hands
Yes, it can be a bit of a hassle to wash your hands every time you take out or put on contact lenses, but your fingers are spots that θέλετε you do not want to know what germs they have.
Not all germs are equally dangerous, but if you are unlucky you can even get keratitis (it is an infection and it hurts!).
Also do not forget to dry your hands before doing anything because otherwise you will transfer water to your eyes.