Everyone is psychic, it's nothing special. However years of social conditioning has desensitized the majority of people. Yet still everyone uses their psychic abilities everyday, to some degree (usually the gut feeling). Everyone is always being subjected to psychic information, but usually either have no belief, no practice, or are to preoccupied with other things to even recognize any psychic vibes/information. So to answer your questions:
1. It won't be a problem when performing rituals or spells, because you're mind will be concentrated and preoccupied. Meaning it will be hard to recognize or distinguish any psychic phenomena unless you're very sensitive.
2. Yes you can perform rituals and spells, anyone can.
3. Everyone is psychic, nothing special. So are animals.