I wouldn't discount what gp is saying though - having an (or a few) experts on hand from the start, can help training the first new convert "the right way" and

I wouldn't discount what gp is saying though - having an (or a few) experts on hand from the start, can help training the first new convert "the right way" and they can then mentor the next one and so on. Even just by being availabletto answer questions or help with code review. Doing some pair programming sessions would probably be useful too.