If I may ask, what to you is "too good to be true"?
Is it the way she looks? Her "credentials"? Don't you think that's prejudice? If I may suggest, get to know the person first. That's the purpose of a chat, right? Getting to know one another.
I know sites like this have people from all walks of life, and that includes those whose intent is to prey on innocent ones. I think communicating will flush out the real ones.
I confirm this. Stay as normal as possible. i.e. you would not stand up in a bus and shout to the people: "I am Joe Smith, I have been divorced. I have problems with alcohol. But I am a sexy man."
So, if you dont to it in the bus, dont do it in chat. Talk like you would talk to somebody you met by chance in a cafe. Talk about basics like: hello, I am Soandso. Say something personal to that person you want to get know. i.e. something about the hobby the person mentioned...
Keep it small talk. You will realize quiet soon, if this person is a normal single as you. Real people can talk about real stuff in a real way.
Me personally I dont give any contact information soon, no e-Mail, whatapp, skype, hangout, viber and do on. You will not do it in the bus eather: "hello again, I am Joe Smith, I am still living with my parents at pine canyon rd in Palmdale. My phone number is...".
Serious people are not getting bored about a realistic conversation. Its the way to get someone to know. Once the time will come to ask something personal: "Are you interested in Sport? I do soandso. How about you?" or "Would you like to tell me somehting about your job?".