PLEASE HELP FIRST WEDDING NO EXPERIENCE

so when I started photography my friend got engaged, and I want to get into wedding photography so I foolishly offered to shoot her wedding. Since then I have spoken to other photographers and they are telling me I NEED to second shoot or shadow or do some kind of wedding photography class before I shoot a wedding. I’m open to doing all of those, but how do I get into doing all those things? How have you guys had luck getting into that?