xraf, I don't think you are giving good advice.....
I have had a mix of people come to me for multi ratings recently and without a doubt all of the low hour pilots have struggled the most. At 70 hrs going from a tame school trainer into a twin is a quantum leap. Navigation requires more attention and everything goes wrong at a much greater speed.
As Gcolyer points out struggling with the twin really knocks your confidence. The same with any high performance aircraft. I have a guy doing a conversion onto the lance with me a the moment. 150 hrs and he is struggling to manage the performance.
But what would I know.