If you’ve already made a mistake and a “reactive” lifeline will keep you from making an unraveling mess, a tiny circular needle is a good tool to use.
The 40″ size 0 US needle I use for this technique is an Addi Turbo needle.
The yarn I’m using for demonstration is Knit Picks Wool of the Andes Bulky.
The DPNs I used are Knitter’s Pride Bamboo DPNs.
My nail polish is by Julep, color “Evan”.