if I'm not there, start without me

all there

Mentally competent; not absent-minded or insane.

as if there were no tomorrow

To an excessive degree, oftentimes with little to no regard to future consequences; desperately; recklessly or wantonly; frantically; very quickly or very much.

be there

To be available to provide comfort and support for someone, especially in a period of difficulty.

been there, done that

An assertion that the speaker has personal experience or knowledge of a particular place or topic and is not too keen on revisiting or redoing it again.

been there, done that, bought the T-shirt

Expresses the speaker's complete familiarity with a situation, with overtones of cynicism or exhaustion.

been there, done that, got the T-shirt

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

don't go there

Do not broach that topic.

flying start

An especially good start.