After agreeing to time, price (with a pro), and a real-time communication method, make the booking; even if the agreement terms can't be selected, at least they'll be in messaging. With a non-pro, the same rules apply but there just won't be a booking and payment, because non-pros asking for money is against the rules of the site and don't have the booking feature on their profile.
Then, connect through the real-time communication method. Once that's done, ask to trade real-time selfies; if someone refuses, that's an indication that they're either not the person you thought or they look/are so different that it's the same alienating effect (I've seen pics that are 20 years old or from someone else completely, and not just on this site, or through texting).
Once that's passed, then connect through the real-time video chat method, so that you can see and communicate with the person directly to know whether they are what they indicated; only after that should you pay. Never pay before validating. If you don't pay after the video chat starts, then they can just end the chat; not much lost. I've done a few video chats using these methods, and in only one did the person refuse to trade real-time selfies or connect in real-time video chat before payment, and s/he told me s/he would be removing any mention of virtual chat on their profile (of course).
I'm just trying to drop some rules to avoid getting scammed, whether you enjoyed the session or not (scam or not). A lot of people are none the wiser (and maybe they ultimately got what they wanted, who knows). I know I enjoyed a few scam chats for a while before realizing they weren't legit; thankfully I didn't lose money, just time, and maybe a sad heart.
Regardless of whether my own profile pic of me exists or is fully accurate (I'm still not assured enough that this site won't leak it to the public internet or that someone I know in real life won't cause a problem for me with family/friends/associates just because I'm here, whether through ostracization or accusations of lack of professionalism), the above rules for virtual sessions are what I'm sticking to, pro or not, once payment is requested. Your own assuredness is beyond my responsibility. Leave any [un/related] criticism or advice or stories that you'd like. Thank you and have a good day. I don't know if I'll check this thread again.