If you're using a wood plaque for the sigil, one trick to transfer the image is to print it in reverse/mirror image on a laser printer or run it through a copier, then place that image onto the wood and slowly iron with a dry clothe iron on medium-low heat.

It will transfer an almost perfect copy of the image onto the wood. I made my first sigil like this years ago, then went over the copy with a wood-burning tool to give it more depth. It came out pretty nice.