take baby steps 慢慢来；一步步来

【例句】
Sometimes it's better to take baby steps rather than a giant leap.
很多时候，一步一个脚印地去做事比试图一步到位要更稳妥更有效。

If you're extremely gun-shy, take baby steps so you'll feel more confident once you manage to score small achievements.
如果你极度害怕失败，那么先迈出一小步，当你取得一些小成就的时候就会感觉更自信。