Earlier today I wrote a post then decided not to post it.
The post said that I've used to fall in to the same trap, and that my experience is that is someone engages in excessive messaging before a booking, they tend to carry that behaviour afterwards. I used to think "It'll be ok, he's nervous or keen, once we meet and have a chat he'll calm down, and he'll understand the boundaries". What I found out was if someone is like that in the build up they'll usually continue to be like that.