Learning to touch type might be considered difficult. It is just as difficult for a single-handed person as for a two-handed person. It is not more difficult. What worth while skill is not difficult? I found it to be enjoyable. I found learning to paint with watercolors enjoyable. It was difficult. I must have 50 watercolor books. It was difficult to learn the Morse Code. I did it and enjoyed it.
A fellow thinks it is great that I have learned to touch type. I can beat him at golf too! I can build a clock that he can only wish he could buy! It is not great at all! Offices all over the world have typist working day after day. It is just as great that I touch type as it is that they do. NO GREATER. NO LESS GREAT!
I said may. That is because I will never learn the two-handed qwerty. I can't say for sure. The qwerty was designed for the express purpose of slowing the typist down. I have watched the frantic movements of a number of my students who were good typist. I mean 60 wpm and up. I have watched the movements of two-handed Dvorak typist. The moves are short and smooth. 70% of the keys in ordinary text are on the home row. The single-handed Dvorak was based on Dr. Dvoraks studies of the most used keys and the best place for them to be. Could it be that it is easier for a single-handed person to learn to type than for a two-handed student? I think Dvoraks placement may have done a lot to make up for five fewer fingers to type with.