I would definitely, definitely recommend it, but only if you really have a purpose.
In some cases you can also get a call/sign and it can be good to do the ritual.
When you get to 20 or so days, you really feel that something is starting to change, and after you complete the cycle, something really changes inside you. Things like development in the areas that God rules, the strong presence of that God's energy in your soul. Do it and see what happens for you.