Most Helpful Girl
Has its pro's and con's.
Big pro is that you get a huge confidence boost because you know what your doing and you aren't worried about being compared. Another plus is that you don't need to be amazing to be considered amazing because you the first one that made him/her feel fantastic. Which is obviously a good feeling. As mention below you don't have to worry about diseases, or how many other people they kissed or slept with.
Con's are pretty well it might not be as natural feeling and more awkward. It can be a turn off if your constantly having to give pointers.
But, just remember people like different things. Plenty of people actually prefer less experienced partners. Some prefer experienced. Same as some prefer blondes while others prefer brunettes. You can't please everyone!
Not to mention the bond you can get with taking someone through there firsts is pretty amazing.