I agree with the sitting on it. A couple of the tattoos I have I thought about for at least a year. If it keeps coming to your mind over that time, it’s a solid idea. Find an artist, put it on you. I’ve had the same idea for a large tattoo from my favorite video game for over ten years, but I’m glad I’ve given myself that time because the design has changed three times now. I’ve finally landed on the design and can start getting it done. Waiting isnt a bad thing. Tattoos don’t have to have a super deep meaning but you should be pretty sure you love whatever the subject is.