I often hear from prospective students whose greatest worry is that they are beginners with no experience. They have no idea how lucky they are! Having a beginner's mind, without preconceived notions or bad training, is an enviable position from which to start. From such a place come the best opportunities for learning.
When I began with my last teacher, I was not so fortunate. I already had two decades of inadequate Tai Chi practice under my belt. A lot of it was flawed, or simply lacking. Into the empty spaces my previous teachers allowed me to pour my "pictures", my preconceived notions, the vast majority of which were wrong.
Years of additional training were required to return me to my Beginner's Mind. Only from there was I able to learn to the depth I sought.
So what is the first step in learning Tai Chi? Throw out any preconceived notions you might have about what is Tai Chi. The next and closely connected step is to slow down
Tai Chi existed as a fast and furious martial art for centuries before it was slowed down, as an aid to teaching. Famous Tai Chi Chuan masters from the Yang Family were brought in to teach the royal family of China. Since this was in the ending years of the Qing Dynasty (mid to late 19th century), much of the royalty had become dissolute and stagnant. Teaching methods that work for dedicated martial artists do not work for such people.
So the Yangs slowed it down, and the entire world benefitted. Slowing down the art made it accessible to practically anyone who had the patience to learn. The new method of teaching also revealed inner benefits from which we can all see physical, mental, and spiritual gains.