don't change horses in midstream

The phrase "don't change horses in midstream" is an idiomatic expression that advises against making changes or switching plans in the middle of an ongoing project, situation, or process. It suggests that it is unwise to make alterations or replace key elements that are already in progress, as it may disrupt the stability, progress, or success of the endeavor. The phrase originates from the literal concept of not changing horses while crossing a river, as it could risk losing balance or control.