Well that all depends on how experienced you are with casting spells or rituals. How long have you been practicing or studying magick? You should know your basics first and how magick works what it is. To cast a spell you have to have put your own energy into that spell in order for it to work. Meditate before doing a spell becaue it will help you clearn your mind and keep you relaxed. You don't have to meditate but its good because you need to konw what it is you want the want your spell to do as in the outcome of the spell. But remember not all spells can magickally turn you into a creature or change your physical appearence.
Also some of the spells on here have been on this site for a long time and some of them are fluff meaning fake. And some do work. But if you want to cast a spell try also writing out your own as it gives it your own special energy and is much more powerful. I hope this helps you out.
Blessed Be )O(