Especially if you're a complete novice, make sure you have a safeword that's easy to pronounce and someone who will respect it.
This can get very uncomfortable, unbearable and/or painful very fast, if someone digs into your sides or uses a hard brush on your feet, whatever. Especially if you don't know how sensitive you are, that can become a real "tickle hell" within seconds.
I hope you haven't already found out the hard way - hope you meet people in a public place first, preferably a place that's got video monitoring. Most big name coffee shops probably do.
