pull the other one, it's got bells on

all it's cracked up to be

As good as claims or reputation would suggest.

as best one can

In the best possible way, given one's circumstances and abilities.

as far as one knows

To the best of one's knowledge, as far as someone knows or possible information to be gathered about the topic, subject, aspect, or situation.

back to square one

Located back at the start, as after a dead end or failure.

beat as one

To share the same feelings.

become one flesh

To join together in marriage; to develop a unifying bond as a result of marrying.

been there, done that, got the T-shirt

Alternative form of been there, done that, bought the T-shirt.

bells and whistles

Extra features added for show rather than function; fancy additions or features.