get the kinks out
To remove or fix any small problems that are present in something, such as a project. The main development is finished, we just need to get the kinks out before we release the product.
get the kinks (ironed) out
Fig. to fix a problem associated with something. The actors had to get the kinks out before they were ready to present the play to an audience. That'll be a right nice car, when you get the kinks ironed out in the engine.