I had an interesting philosophical discussion during the Contextual Handgun, The Armed Parent/Guardian class this past weekend. The instructor, John Johnston, is very good about attributing his sources. One of his points was a comment by the late Paul Gomez.
The hardest part of the drawstroke is establishing grip.
I told John that I disagree with that. In my opinion, the hardest part of the drawstroke is gaining an adequate sight picture. Establishing grip is the most time-consuming part of the drawstroke.
A good instructor can usually get students to consistently establish grip in a relatively short period of training time. However, getting them to consistently get an adequate sight picture usually takes quite a while longer.
Something to keep in mind during your live and dry practice.