Even when you practice zazen alone$$$ without a teacher$$$ I think you will find some way to tell whether your practice is adequate or not.
Zen practice is to open up our small mind.
In your very imperfections$$$ you will find the basis for your firm$$$ way-seeking mind.
There is no particular way in true practice. You should find your own way$$$ and you should know what kind of practice you have right now.
But do not give up your practice; continue it$$$ knowing your weakness.
The goal of our life's effort is to reach the other shore$$$ Nirvana. Prajna paramita$$$ the true wisdom of life$$$ is that in each step of the way$$$ the other shore is actually reached.
Actually we do not have any particular name for our practice; when we practice zazen we just practice it$$$ and whether we find joy in our practice or not$$$ we just do it.
Just continue in your calm$$$ ordinary practice and your character will be built up.
You do not say$$$ This is enlightenment$$$ or That is not right practice. Even in wrong practice$$$ when you realize it and continue$$$ there is right practice.
We should not attach to some fancy ideas or to some beautiful things. We should not seek for something good. The truth is always near at hand$$$ within your reach.