"Lay down your money and you play your part"
James30, it's cool that you want to connect with the mistresses. There is no mystery to making the session go as well as possible. Make sure you've showered as close to the appointment time as possible, and of course wear clean clothes. Be on time. Treat the mistresses with respect.
The rest will depend on the talent and ethics of the women and how well the three of you communicate. Unless you are their first-ever client or the first guy they've ever tried to tickle, chances are they've tickled at least a few submissives if only as part of a torture session, so playing dominant ticklers won't be something new to them.