If you feel uncomfartably dirty, you will want to shower. You search for a way to switch on the water. This is stage 1. If you don't feel a need to shower, that's stage 0.
There are different kinds of showering that can also be looked upon as stages.
There is (2) a HOT shower - samatha or tranquility meditation, very pleasant, but addictive. Through concentrating the mind becomes smooth and peaceful, but dull. There's a strong tendency to get attached to the very subtle pleasure that is better than anything one has ever experienced before. Yin tendency and a bit like cognitive-behavioural therapy, staying on the symptom level by only covering it nicely. Warmduschermeditation. Using wrong speech we would call this meditation for pussies.
And there is a COLD shower - insight or awareness meditation, rather unpleasant at times, but truly refreshing in the long run. Making the mind alert and clear, it aims at really seeing trough and cleaning away the dirt. Yang tendency and bit like psychoanalysis. Many are afraid of the cold shower, they think they can't stand it. There's indeed some bravery in looking at all this dirt. If you haven't suffered enough, you'll most likely prefer to keep on running away from it.
Wechseldusche: a mixture of hot and cold showers is considered to be healthiest. Yin and Yang should be balanced. If, especially in winter, the cold water becomes unbearable, it's good to switch to hot water for a while to sooth the threatened mind.
There are furthermore among the cold shower group three different ways. (They correspond to what is looked upon as the three vehicles Hinayana, Mahayana and Vajrayana in Tibetan Buddhist thought, but the approaches can also be found in other traditions.)
The METHODICAL approach (3) cleans the body part by part using a certain kind of soap (technique). This is so to say safe, as it can be taught and learned, and progress is bound to be achieced with it. But the process takes altogether quite a long time and quite some effort. One easily has the impression that its an endless undertaking and that new dirt always enters the parts you have cleaned before. There's furtermore a tendency to get attached to and stuck with the particular soap one has been given and found so very beneficial. Without it one feels increasingly unsafe, even more dirty then before. Too much soap has harmed the skin and disabled progress. It's like falling back to stage 2. This is of course not necessarily what happens! And there is also hardly any other way to switch on the cold shower.
The EMPTINESS approach (4) dives into the ocean and lets the water do its job. Once you feel you can swim and are brave enough to dive into the unknown, you leave behind every method and effort and even the idea of doing something. In a way it is also as if you noticed that you do not need to use water to clean yourself, because you ARE the water. Some Zen schools teach only this from the very beginning and leave most newcomers utterly helpless and confused with instructions like "Don't do anything, you are already there!".
The NON-DUAL approach (5), which directly perceives that the water and the dirt are not different, is going beyond the illusion that there is a need to clean anything at all. Everything is already perfect as it is. Not being in need of a shower to switch on, a soap to make use of or an ocean to sive into this is so to say non-meditation. Instantly transforming everything seemingly negative into pure luminousity, this is very fast and effective, but it is easily misunderstood as being exactly the same as stage 0. (In a way it really is .... but only in a way. As Zen says: At first a mountain is just a mountain (stage 0), then a mountain is not just a mountain, but then again a mountain is just a mountain (stage 5).) Therefore it is considered to be kind of dangerous, was formerly kept secret and transferred to the highly advanced student only. It is kind of intuitive and cannot really be explained, taught or argued about. It's beyond everything.
One might want to proceed through all five of these stages of showering after one another. But this can hardly be planned. Who would have planned to go from 0 to 1? It just happens. If it happens. And being at a certain stage, one can so to say by definition not really conceive of the next one. Whatever happens, happens. Whatever does not happen, does not happen. As people say over here: Do your best and leave the rest - to Karma (or to God, the universe or the Weltgeist we might say if that suits us better).