Well, somebody has got to have the patience 
Pretty much, but I have yet to run into one that is solid core. Usually JSTs give you a little more than 7-8 strands and I lose 2-3 of them stripping 
. I will see if I have any JSTs left from my salvage of other projects. Also we will need a 1K resistor to hold the reset on the Arduino (unless you want to pull the Atmega).