I realize you are concerned about safety, but nearly everybody in the world does fine on their own without the help of a partner to rescue them from cutting their fingers off. If you don’t trust your partner to navigate some risk you are infantilizing him and undermining his feeling that you trust him. It can cause long-term damage to your relationship.
If you need to guide him, try to give praise when he does things right. It will likely be more effective and less damaging.