Shielding yourself through meditation. And there are some protective herbs that you can burn whilst your communication, and you can put a circle of salt around yourself and charge it with energy. If you have certain crystals to work with, you can probably use those, too. Sorry I am not being very specific, these are just suggestions. Try burning Sage and possibly Rosemary. Good luck.
It depends what being you want summon. Mostly is strictly recomended a magic circle. And a good talisman.
But demons are different. Good books about are Claviculae salomonis, there are precise procedures described.