Take your time to do things. If your lazy you will never accomplish a thing. Don't relay on your parents to do everything for you and they wont always be there to pick you back up when you fall down. Never take things for granted.
Line 3 used metonymy, when Wordsworth refers to the "pen" here, he doesn't actually mean some giant all-powerful writing implement Instead, he's referring to the whole English literary tradition of the past.
He wants to know you on Reddit. Maybe he just wants to make friends.