Its not like a lady just woke up one morning and decided she wanted to be a provider.

More likely she has been dipping her toes in the shallow end  already in the civvie world and has decided she likes what she's doing and wants more.

I was dating lots of generous married guys for years before I decided this was the road I wanted to take.

upon the lady's personality and confidence.

If she is "new", and very uncomfortable (whether that's about her looks, performance, safety, LE, or whatever) that nervousness will come across.  And a nervous young lady walking into the room is likely to trigger suspicion in the client.  That in turm makes her MORE nervous, etc.

In those cases I think it would be very good for her to admit she's new and that's why she's nervous.  Exactly the same advice I would give to a first time client so his nervousness doesn't spook the lady.

Additionally, it seems a lot of guys like being the first in line (and some ladies do too).

pretty new but not a total rookie.  Then I'd read everything on the self help section, and way back on this board and at least some on the others.  With that education, the newer provider will know what to do & not make rookie mistakes.   I think most clients follow normal rules & she'll quickly learn them...