The idiom to 'dot the i's and cross the t's' is usually used to describe being at the end of a project or negotiation and to pay very close attention to the details. To 'dot the i's and cross the t's' means to be meticulous and make sure that nothing is out of place, this idiom is often used to talk about going over arrangements or contracts for something.

1. The negotiations have gone well and the deal is nearly done. All that's really left to do is dot the Is and cross the Ts!
2. Before submitting your proposal, make sure you've dotted your Is and crossed your Ts. You might only get one chance at this so it needs to be right!
3. We haven't quite got around to dotting the Is and crossing the Ts yet, but the contract is pretty much ready to go.

1. I am almost ready to print my thesis, I just need to go over it to dot the i's and cross the t's.
2. We have every ready for the wedding. I'm just going to dot the i's and cross the t's before the guests arrive.