I'm planning to really put some effort in this one, due to lack of time, I decided to go on as soon as I have Bronze at the moment, however I already went to Gold the Samba busses, for the TGTT and now want to go for this one.
It is part of the GT5 way, since Bronze (which is not hard really!) gives you the track you need to master in most parts of the game, you can drive it with any car in you garage or otherwise available and get to know the track really well. Then you can go back and gold this event.
Patience and persistence will do the trick, I believe.