We put a lot of trust in Ts, and it IS very scary to do this with a stranger that we don't know well. It's definitely not a natural thing, and especially since you had a terrible experience in the past, it's understandable how anxious this would make you. Maybe you can try to look up potential Ts online and see if they have a website. Sometimes this might help you decide if you would be comfortable with them. Maybe you can also try talking to them on the phone first? That might help you gauge their personality as well. I'm sorry your T has to leave for the summer.