The one great thing that us guitar players has above other " melody instruments" is that for the main part we can sing whilst accomanying ourselves.. try that with the trumpet/flute .. whatever..
I daren't answer sophocleese because the G string is the one I usually break.. and there's a good reason for that, in that it has the highest tension than the other strings on a standard accoustic...
And I have to agree with Frank re Django Rheinhardt.. how anyone could play the guitar with (was it two or three) fingers missing off his left hand, just blows my mind
If like me, you're into "Irish" music, and you play the guitar, you'll soon know your place.. your not going to be the star of the show.. but if like me you are fortunate enough to be associated with a "true musician" who can play all the diddly stuff.. even if they don't come outright and say it.. you know just how important the guitar is in laying down that accompanying ryhthym is...
So never be discouraged... the guitar is here to stay.
Mick