Hands on is the best teacher. Just get in and do it. Being careful not to hurt yourself.
It helps to have a not too critical handyperson behind you to alert you when they see you doing something wrong.
Are they the orange ones or stainless?
I know the threads are a proprietary size. Research other companies that sell them and you'll get other drill dimensions. Eventually, when you have the right size hole, you'll still have to apply some pressure to start threading them in. Put some plumber's...