Yeah, 'simple' doesn't always equal 'easy'. The basic steps are simple enough, but leatherwork can be as simple or as complicated as we make it. Time spent practicing new skills and techniques is never wasted time. I have a box full of scraps that I've kept from my practice of cutting, tooling, sewing, dyeing, edging etc. I don't know why I keep that stuff because I rarely find a re-use for these pieces. But at least I can see where I've improved, as well as where I need to practice a whole lot more.
Now, time for me to practice making a holster pattern.