To be honest, I've never had a firsthand experience with an Ouija board, so I can't say I fully understand what you went through. I really don't want to sound condescending, but perhaps the spirit you came in contact with simply did not want to be badgered with questions and reacted in the manner it did? Coming from a Christian background, I do have my apprehension of spirits and demons too, but I think it's alright to approach the topic with an open mind
[Yes, I am a hypocrite. Please don't judge
In the likelihood that you do end up drawing the Devil card on first try, you still need to understand what the card's meaning is meant for you in regard to the spread's positions too. First reaction to seeing the Devil card probably won't be a super-happy-fun-time reaction, but there could have been a reason why the card showed (ex. Bad shuffling, by chance, etc). It's like asking how someone would react if the Death card showed up too. First glance reaction is possible surprise, but I doubt some similar event from the Exorcist will occur in your room the moment the card's face appeared.
Worst case scenario: You don't try the spread. But I personally think you're calling out to someone (ie. the universe) when you're using the deck, so technically you're already calling someone to you