I don't regret anything I ever tried, and I tried a lot. For instance, I spent mornings writing but afternoons for a month copying out my favorite verbs from a thesaurus, put them on tiny post-it notes and stuck them all over a wall. The plan was, I'd be stuck, or just musing, and I'd look up and see a good one and use it. Never happened that way, but I still think the exercise may have helped me somehow. I read a number of how-to writing books, and if they had exercises, I did them, cheerfully and with serious intent. In three cases, these "exercises" became sales and in two, cashed checks. In all other cases, I probably learned something. I've taken colored highlighters and analyzed novels for exposition vs. summary vs action vs dialog, for handling of time, for dialog tags, for description upon introduction of character. None of this replaces the writing time, which is most important, but it all gets tossed into the stew.
If you're poor, use your public library to get how-to writing books. If that's not your thing, also fine. Some people pick up craft unconsciously while reading good books; others benefit from directed study of the craft.