Saying hello- Easiest
Saying no to someone you care about- easier.
Telling someone how you feel about them- easy.
Taking a crap while constipated- Hard
Letting go- Harder, but hold on, we're not done.
...Leaving things behind- Hardest.
Saying goodbye- Nearly impossible.
Letting go is easy. It's the people and things you leave behind and say goodbye to that make it hard.