As by a Wizard's Spell

Purify yourself before any spell. Before attempting to perform magic, you need to get into the right frame of both body and mind and cleanse away any doubts, demons or spiritual impurities that might distract you or make the spell go awry. Ideally purifying yourself should be a ritual in and of itself, and should leave your body relaxed and your mind clear.

Martini & meatloaf, check.

Purify your space. If you are going to be working inside, make sure you won't be disturbed and tidy up the location where you intend to perform your spell. Visualize negative and distracting energies dispersing as you clean.

Pluto? OK, why not?

Invoke the divine. Verbally call on a higher power to bless your spell. This can be a general prayer to call on the help of some deity or force, or something specific you wrote for this spell. Your invocation can also include gestures, music, dance, or ritually lighting candles or placing objects.

Jimmie Carl Black, the Indian of the group.

Recite your incantation. For each spell, write a short verse describing your wish and asking it to be granted. It doesn't have to rhyme, but rhymes, alliteration, cadence and other poetic structures help with focus and memorization. Speak the incantation clearly and confidently while you visualize.

I don't think I can emphasize too much the importance of this step. It is the sine qua non. Can we agree on that guys?

Give thanks and clean up. Say thank you to any specific deity you invoked. Ground your excess energy by visualizing it flowing into the earth. Undraw your circle, if necessary, and dismantle your altar if you aren't going to use it again. Gather up your tools and leave the space. Your spell is finished. Consider doing something mundane, like having something to eat, to center yourself.

I SAW the Night caught, as by wizard’s spell,

  In the red meshes of the setting sun;

  From her black plumes the lurid light had won

A flash of sheen, and she grew visible.

But like a stricken gladiator fell    

  The weak-eyed sun beyond the hills of sleep;

  The cloud-fires smoulder’d to a grey ash heap,

And Heaven whitened to a curvèd shell.

 Night - H. Duncan Hall

liberally used: http://www.wikihow.com/Cast-a-Spell