Do you have to have a ceremony Rehearsal?

So I was just leaving a comment on someone's post and I said that I wasn't going to have a ceremony rehearsal. Now that I'm thinking about it. I am a bit nervous not having one. Our venue will charge us $300 for an hour for the rehearsal. That's just not in the budget. So I was thinking I would take the two outside vendors to the ceremony site and just show them where the site is. My photographer and the officiant are the only two outside vendors I have, and the photographers have already been there before. Everything else is through the Ceremony vendors. So I would just show them where it is and that way they can see what we will be working with. Then we can just create our own rehearsal. I mean it really can't be that hard right. I mean we can just plan out every little thing and it should be okay...right? lol Has anyone else nixed the rehearsal. If so how did it go? Or any thoughts?