There are reasons, increasing in number and quality, to believe that the masses of ordinary galaxies may have been underestimated by a factor of 10 or more.
I think it's always when you go to caddie for another player, it's no different to when you start with a new player. The very most important thing is when you get the first opportunity to have a win is to try and show them that you know what you're doing. It's easier said than done.