The single most useful piece of writing advice I have gathered from reading books, blog posts and articles on the subject is: use bum glue. To be specific, that means glue yourself to your seat and stay there. You can fiddle about with fancy word processing software, gimmicky grammar tools, and writing websites, but in the end, it’s just you and your willpower.
I don’t mean to say that you can force words out of your brain from sheer force of will. What I mean is that once you sit down and commit to sitting there for a specified period of time, you will eventually put fingers to keyboard (or pen to paper) and get work done. Maybe you need a cup of your caffeinated beverage of choice to activate your mind. Maybe you need an arrangement of cushions and footstools to get comfortable enough for the words to flow. Once your writing environment is in place, all that is left is to stop messing with it and just write.
I spent a long time in this space where I would just read about writing and not actually write. Sure, I picked up on the finer points of putting together a manuscript, but the writing process itself was quite neglected. The fact of the matter is that you learn by doing. You can choose to spend all your life making one piece of art or spend your time making different things and improving along the way.
Most things worth knowing are simple. It is when our natural resistance to making effort comes into play that things get complicated. You can choose either to “keep it simple, stupid” or make life unnecessarily tangled for yourself. It’s your choice.