The other pre-requisite is ....Talent!!! Otherwise it is a constant flippin that burger over on the grill until it's done...some peole just can't cook! Never will!!!
If you can't throw a spiral with a football, throw a slider with a baseball, shoot a free throw with a basketball with proper form, or just plain flick a "booger" with your right forefinger you've got no chance ...lack of proprioceptive skills...that is the secret to feeling lag pressure on the #3 pressure point...So keep inubating until you aquire more and more proprioception