Is childbirth education classes necessary?

Gabriela • First time mom. 23. Due 06.26.17
I am 18 weeks and have started to think on whether I should take these classes or not. In my hospital I believe they offer one whole day for $175, where they'll talk about labor,  delivery, and postpartum care. 
I am a very anxious person and first time mom, and am not sure if this class would benefit me or just scare me more lol.
Has anyone taken or are going to take these type of classes? My husband says I shouldn't waste money, but I think knowing some good techniques for labor might help me. But could I also just get this information online lol 
Thanks.