We get better at what we practice. (I hope this is not some big revelation to everyone!) From this premise, I have two points I would like to make.
First, practice does not mean just showing up and going through the motions of our workouts. That just makes us better at doing a half-assed job.
The second point is related to the first. Good form is crucial, because when we are practicing, we are learning form along with improving our fitness. We don’t want to imprint bad form in our minds and in our muscle memory if we can help it. A second set of eyes on us, especially a trained set of eyes, can help us know if we are practicing good form. That said, our form doesn’t have to be perfect from day one; we can refine it as we get stronger/more flexible/more fit/more knowledgeable.
Go play.