It uses stress to show where you are failing. For some people, this can create major problems, but for those who are clean and protected, or otherwise advanced, they can handle this stress better.
It is ultimately positive, but its contractile function can appear harmful, when this isn't necessarily the case.
Lastly, be mindful of earth overload and feeling tired, which requires you to compensate with elemental balancing.
Every magical working, not only a Runic one, if started at the right time is more powerful.
For discipline the Waxing Moon in Capricorn is the best. Look at the calendar to see the favorable dates.
Be disciplined, do auxiliary works to condition the positives in doing so in your life. Do not do a Saturn, which will externally oblige you or worse, internally force you by the nature of your being. Do this by your free will and it can be accomplished. After a lot of purification and stability of the mind and material life, after a certain already acquired discipline, of course, do some Square and perfect your life even more. But it will still force you to address specific things, which is a process you must undergo afterwards.