Not sure if you're genuine but I'll assume you are.
1) You might like to consider a half hour rather than one hour, if you're that concerned about awkward silences and/or how to fill the time up
2) You exhibit a somewhat naive perception of what punting actually is (no offence meant). You are the one that is paying, therefore it is really for the WG to provide service to you, not on you to get worked up about if she finds you boring or whatever. Be clean, polite, friendly, but don't feel burdened by having to be some kind of mix of Brad Pitt and a stand up comedian in order to punt. Neither of you are there for you to hand over £120 and then be openly judged on your looks or personality.
I read an enlightening post on SAAFE the other week where a woman said she always found it odd when people asked her how hard it was to do MFF threesomes, considering she is straight. She pointed out she doesn't fancy women, but doesn't fancy 99% of her clients either so it is no different. So just go, enjoy, leave, don't over analyse.