Simple Evocation Ritual

[battyboy12]

I've been training myself to prepare for an evocation. I've been practicing concentration, meditation {for a while now}, visualization and such. I plan to evoke Purson so I've been doing the proper research. However, some of the materials are costly and not easily acquired. Is there a simpler method of evocation?

I heard online four candles set in a square formation with a black scrying mirror works, while chanting the name of the entity. Is this true? Also, does a pendulum help in any way for an evocation?

What other items might I need for a simple evocation such as this if possible? I plan to proceed in a few months.