If you'd have it done, Go: if not, Send

Doing your best means never stop trying.

Better slip with foot than tongue

One thing is sure. We have to do something. We have to do the best we know how at the moment. If it doesn't turn out right, we can modify it as we go along.

We do our best that we know how at the moment, and if it doesn't turn out, we modify it.

The definition of insanity is doing the same thing over and over and expecting different results.