Equipment Options

I have a really retarded question. As I stated in an earlier post I am new to goetia but not to ceremonial magick. I was wondering how much of the equipment from the Goetia is really essential to get results from this kind of evocation.

I have a circle with the holy names on it. Its not the same form and design as the one from the lesser keys however(its my own design).

I am also making a triangle of art with a skrying mirror on it. So the triangle won't be the floor variety as in the Book.

As for the bass box, sword, and everything else, I don't have them. All I have is standard Golden Dawn equipment(minus the sword).

So do you think all the trappings are essential? Would it not be successful without following it to the "T"?

What I also wonder, is in some books they say the magician is supposed to wear the sigil of the creature you are evoking, however in other books the sigil goes in the triangle of art.

But where does this all fit in when you have the mirror version and not the floor version of the triangle of art? You cant put the sigil on the mirror at a 45 degree angle. Unless you make the sigil in flashing colors and stare at it, then look into the mirror so that the sigil is projected unto the triangle of art(mirror)..

What would be your advice?

Oh and the Temple of Astarte has an evocation correspondence course out in print, would you recomend this?