isn't there web series about tulpas (greylock?) idk I vaguely remember hearing wendigoon talk about it once.
Anyways, from what basic research I do online, this seems like an easy thing to fuck up. Don't try summoning these things unless you have the spiritual will and physical capability (a weapon like a shotgun) to deal with the fucker if it goes rogue.
I don't personally mess with shit like this, you're basically inviting demons into your home. Keep a crucifix or other "holy" items nearby, might as well attempt to mitigate whatever damage could occur
