go down the hill with an experienced rider who can act as a pace setter for you and see how he/she chooses the "line". Try to ride your bike on the same "line". Ask the person to take it easy for you so you are not trying to go down at race speed. Do this a few times so your body and your mind get the feel of coming down a hill.

Taking a full lane on a curvy road without or limited shoulder is a smart move provided you are not going so slow that the cars coming up behind you don't have to lock their brake.

Just practice.

fear is not what we want when we ride our bikes

enjoy your ride.