Would reccomend a light weight sleeping bag if you are going in summer. The nights are warm, and you won't need much. And if it is cold, many have blankets to borrow as well.
A light weight sleeping back only puts you back about 1kg, so worth the weight for a good nights sleep
Difficult one
Personally, I really enjoyed the bit from St Jean Pied du Port - a really rough start but incredibly rewarding. Doing 9 days out from here would get you to roughly Belorado. Quite a mix of terrains
Other than that, I'd probably say last few days into Snaitago, but continue on to...
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