Coconut Oil is your friend with two-strand twists. Add a dollop to each twist you make. Alternatively, jojoba oil is great.
You need to prioritise doing two strand twists, especially if you want to make thin ones. I would advise watching your favourite TV show whilst trying to accomplish this.
3) Denman Brush
I found my hair is softer for two-strand twists when I use my Denman before I twist. I think in this case, find a brush/comb or technique that suits you but soft hair is key to getting two-strand twists just right.