The Spells will either work or not work for you depending on a number of combined factors. You may have to consider the proper moon phase, The planetary hour or day, The will of the universe, Your experience, and your belief in magic.
Let me clearify a bit more, if you do a spell you cant expect it to just happen you have to help it along. Spells will help you achieve your goals like you notice you have changed some of your eating habit, or you started exercising. Spells work differently for everyone, you have to believe in the spell your doing this is most important. You cant just do a spell and walk way saying i hope it works there is and has to be an effort on your part. If you do a love spell you cant expect prince charming to knock on your door you wil have to get out and meet people, you have to help it along.