You can either have quality and results or a lottery.
If you want to eliminate guessing, go for the whole process. This includes an extensive research period where (from the tangible results point of view) not much is happening.
While this “not much” is happening, it’s building the foundation for all the results. Without it, you’re wandering in a dark room, with a flashlight with dead batteries, clicking the on/off switch repeatedly, hoping for it to work.
So the choice is easy. You want it today, or you want it good? I can do either. But I can’t do both.