Make sure you're spending time visualizing what you want. That's the key. You have to sit down and really imagine the full scenario in extreme detail. Spend at least 10 minutes doing that but the longer the better. Once you're done you have to believe that it will work. If you start doubting or worrying quickly remove that thought from your mind.
If you are feeling that your spells arent working or wont work, then you are being counter productive. What we say and think about our workingsafter we have done them still has power and can havean impact on them.
Itcould also be that you arent giving for workings enough time to work, they arent instant and can take months to manifest.
The spells youre trying may also be fake with no chance to manifest or you may not be taking the time to correctly put your energy into the working and so they dont manifest
There is a post here that could help you know why your spells arent working.
Everyone is right. One of the most important elements in spellcasting is intent. You have to really really focus, visualize and concentrate that focus/energy into the object or median you are using. I've been practicing spells with cooking and food recently. My back was in severe pain. I cooked a baked potatoes and focused all my heart and desire and intent on healing and curing as I added and cooked the ingredients. The next day, I swear the pain was gone in my back. Its alot about intent, mind, and energy