I have just come out of Recruitment, having gone from being in a grad position to mentoring grads in under a year, I would say you need to prove all the Recruitment buzz words. Tenacity, resilience etc etc. don't be afraid to ask your manager if you can start BD next week, say your ready for it. I used to love this, I argued with my directors at week 1 so I could do this. They loved it, and similarly I loved being argued with by newbies.
i was always taught to ignore office banter. Whilst at work, are you there to have fun, or are you there to make money? Obviously you need to have a breather every so often, but that blind determination will set you out from the rest. Recruitment might be a team sport, but when it comes down to it, you are there for you to make as much money as possible, so bear that in mind.
the best word to describe my stint in recruitment was Ruthless. But don't loose who you are ;-)
not sure any of that rambling helped!!
good luck!