I found that a moderate diet and regular lifestyle makes some of these somewhat redundant.
I did dhauti when it was tought to me, I performed it without fault, but I am not practicing it. I mean, rather avoid the situations when it might become necessary.
I also did shank prakshalana when I learnt about it, and performed it a few times since than … But I would advise care as these drastically adress the digestive system.
Neti, allright, basti probably also not that dangerous, if not performed too often, as the colon has it’s natural bacteria necessary of post-dygesting the fiber from foods, where important vitamins (K) and fats are produced and reabsorbed. So one would not want to interfere too often. If you are fully clean (both mind, and body), and healthy, there is no need. But because these are quite hard to accomplish, somtimes these practices might become necessary.
There is no need to be shy about these things, the human body is divine and great in all its aspects and functions. What is less divine is what we do with it, out of ignorance.
Uddhiyana I see coupled with pranayama, with awarness directed to pranic processes. Maybe nauli is more forgiving in this aspect.
I think it is extremly important to maintain balance in these, and not perform them as means of achieveing something, rather one should arrive into a state where these naturally flow out of the wisdom of the vital body.
