I used to dislike meeting newbies because I found their nervousness/anxiety to be contagious... but time seems to have changed my outlook.  Nowadays, I am happy to receive date requests from newbies and definitely try to make their first foray into this hobby both as pleasurable and instructive as possible.  

Here's why:

1) very understanding of, and willing to comply with screening requirements (sometimes so eager, it seems they'd give me a blood sample if I asked for it lol)

2) follow all my procedural requests to the letter for the day-of and at beginning of our date  

3) usually have noticeably just showered, shaved, and made every effort to be well-groomed.  I love the clean smell of soap and toothpaste!

4) respectful, considerate attitude (even if anxious) including COMPLIMENTS (hey, a little flattery can go a long way..... even with professionals)

5) newbies are often a bit shy, and I find that to be a very refreshing change of pace  

6) the eagerness to do everything right in order to get an "Okay" or a future reference is very welcome.  Having someone actively currying my favor is.... well... not priceless, but a wonderful feeling (not in a power-trip way) in contrast to my usual dates.

7) they say THANK YOU prior to leaving

 
Yes, a lot of these are little things and/or are those that are regularly mentioned here... but the "little things" can and do add up to a VERY pleasurable experience.  :-