Half the battle
A large part of the work .Writing the letters will be half the battle. We can finish the rest of the work later.
Halfhearted
Not enthusiastic, not interested.The woman made a halfhearted attempt to find a new job.
Half-baked
An idea or plan that is not thought about carefully or not studied carefully.I do not really like my friend's half-baked ideas.
Hale and hearty
To be in very good health, to be well and strong.My uncle is hale and hearty and he never gets sick.
(one’s) hair stands on end
To be frightened or afraid of something.My hair stood on end when I saw the scene of the automobile accident.
The hair of the dog that bit you
A drink of alcohol taken when one is recovering from drinking too much.My friend started the day with the hair of the dog that bit him.
Hail from (somewhere)
To originally come from somewhere.My father hails from a small farming community.
Had better (do something)
Should do something, ought to do something.I had better go now or I will be late for class.
Have a chip on one’s shoulder
To seem to want to start a conflict or quarrel.Our neighbor has a chip on his shoulder and is always trying to start a fight.
Have a change of heart
To change one's attitude or decision (usually from negative to positive).I had a change of heart and will let my friend use my car tomorrow.