First of all, thank you for reading this post. I feel like I am about to step up a little notch in technique/ability. So far I have just been using cheap vellum bristol type paper. One question I have is, is it possible that given the substrate that it is easier to make mistakes? The flip side is: if I get really good at dealing with the cheap paper I have, using the right/better paper (quality smooth bristol) should just make my life easier? Second question: I am not liking com art paint too much. It could be user error, but the paint seems to splatter too easy, even at low pressures. Maybe the paint it too thin, because I am barely applying the trigger, and getting significantly thin lines. IDK This move into question three: springs? What are the differences? Why would someone change them? Do you only change the spring that relates to paint flow? Do you also change the spring that relates to air flow? Stiffer or less tension? Why? What for? Next question: replacing trigger? What, and why? One more important question. I feel most comfortable holding the airbrush with both hands and hovering over the painting. Slow super straight line are difficult. Does any one have an example of how to hold the airbrush, while letting your pinky rest on the paper? Or, can I just slowly perfect thin straight line with out the pinky touching the paper. (How the hell does the Russian women achieve those perfect line)? I am using an Iwata HP-B+ Again thank you for sharing your insights and thoughts.