I'm not naturally a yoga (Ommmmm) person but really, really rare what regular practise, a little often does for me.
The thing I had to get to grips with is to follow the purpose of any pose, rather than to try and get into the position demonstrated by the teacher. I am a bit competitive, so found I often used the wrong muscles (back instead of abs for example ) in order to reproduce what I was seeing others do.
My bad was aching more, the mire I did well any exercise
I looked for teachers and classes interested in therapeutic yoga. A good sign is when the teacher demonstrates the simplest version of a pose, and then shows how to go deeper, rather than starting with an advanced piss and explaining if you can't do this then do .... it's not much fun being the person who can't do that.
The right teacher is important. Its also important to do a little often, so say ten minutes when you wake up (or stop work). You may find once you get started you are happy to do more. You will get surprised how much more you can do.
Very satisfying when you see real progress especially on the poses which you always find difficult. Those are the one which need "double practise"