I've only got services done by newcomers since I started getting them done. Lot of them are looking to scam but you just gotta be smart enough to make scamming not worth it for them. What I do is make them pay for all the supplies and the bond etc, so I really take 0 risk! I reimburse them for all of it on completion.
Also, I can tell a scammer from a sincere person just by the way he talks and acts.