I worked for BAS as a Field Assistant and guide for the scientists for 18 months about 13 (seems like yesterday) years ago. And that was where I got bitten by the flying bug: part of our remit was to go as Pilots' Assistant to pour the coffee, dig out the fuel drums at remote depots and baby sit the pilots. Would you believe one guy came down (really good pilot) who had never seen snow before. Then he landed in the Antarctic: a baptism of, well, not fire, but you see where I'm going!
Suffice to say, I enjoyed that bit of the job so much I chucked in the guiding contract which had originally been for 30 months and came North again to go and get my licence.
Don't think about it too much, don't read too much about other peoples experiences, just go and make it your own adventure. You will never regret it, and probably never stop talking about it!
Good luck, and put me on the postcard list too!