영어 문장에서 only 해석이 궁금해요

Best of all, I can do them all again at any moment. The books are there.
I have only to reach up to the shelves and take them down to relive the moments I have loved.
여기서 only to를 고려하면 빨간 문장을 어떻게 해석하면 될까요?