Wiccan Rede

"Bide the Wiccan Law ye must,
In perfect love and perfect trust.
Eight words the Wiccan Rede fulfill:
And ye harm none, do what ye will.

What ye send forth comes back to thee
so ever mind the law of three.
Follow this with mind and heart,
Merry ye meet, and merry ye part."

The one law that we are to follow, but it's an extremely important one. To cause no harm doesn't mean only physical pain but any hurt or pain in the slightest. To show disrespect to anyone or to they're culture, religion, or thoughts, hurts them. Even in joking we have to be careful, someone may laugh but be hurt. This can all be done without magic. How can we be sure that what we do will not cause harm? You can not intend harm and add to the ritual/spell and harm none, but does it change the ritual/spell so it doesn't harm? How can you be sure that it won't cause harm even in the slightest? I have only done one ritual/spell and that was at the past Sahaim. I have been reading and studying online, mostly online. The more I find out the more I am scared, I'm scared that even if I don't mean to there will be a chance to cause harm that I don't know about. How can I be sure? The more I learn the more the possiblities that I think about. Am I just going to indepth or am I not meant to do this? I know that this is my true path nothing felt more right. How can I do rituals/spells with not causing harm? I study so that I won't cause harm, I have a friend who does instead. That is her way and it works good for her but I'm scared if I don't know I will unintentional cause harm. I want to do more but fear stops me. How can I conquer it? This has been something that has bothered me for awhile, most people have done something. The only thing that I really do is meditation. I try and meditate when I have time to myself, wish I could do more but when you don't live alone it's hard to have that quiet time. I have ask my guide to show me but I have not recieved an answer, that I know of. Maybe it's not time yet for me to start with spells, mostly I have been shown some of my past. Is my answer in my past? I'm searching for answers but as of now none have come.
May the Goddess send blessing to all.