I wouldnt say scared but as a long time player i would say if you let them they will Grind you down to a pulp. If your playing a lotta tourney with a Team pro or famous legend just know that they want you to be afraid and if you dont know the game they will figure it out quick. They are a lot luckier than the average player i will say that.
No, not afraid of facing anyone on the card table. The only thing that really separates us is experience and the only way to improve your game is to play with people who are presumably more experienced than you. Shuffle up and deal!