Plenty of keyboard warrier's on here, all the "sack em", "forget em" "blow em out before you start" etc, What are you risking, ?? Might just be a careful Guy, wants to see if you can do a good job?
Custies dont all have to fall over and grovel to get your services, I am sure if you price it right do a decent job there is more than an 80% chance they will turn out decent, With those sort of odds you should be giving them a go not coming on here asking "for often" ignorent advice, You dont have to like your customers to work for them as you are actually doing it for the money.but they have to want you to do the job, Thats a big difference.
Go and do the job assess what you see and hear when there and make a decision going forward whan you have more information
after all you will get paid for doing the work,