The big boys will try to intimidate you. Don't ever display fear.
In life, the big will always try to bully the small. And the big does it, among other others, by intimidating. Intimidation comes in many forms, some of it loud and clear, others quiet and subtle. Recognize it, and deal with it. Do not fear it, because that what intimidation is all about, instilling fear. The moment you show that you cannot be pushed around by fear, intimidation against you will stop. You see, a dog that barks rarely bites.
If you fear is real, then face it by pretending you have no fear.