o-dog wrote:what everyone else said, the xbow is definitely a lead/prediction weapon. throwing props in the air and shooting them is good practice.
also, getting bank shots down is essential to truly mastering the crossbow. practice hitting walls at a 45 degree angle so the bolts bounce off the walls. also when you see a curved wall anywhere in a map (biohazard and lostarena have alot of these), practice shooting at the exact place where the wall curves so that the bolt banks around the curve. I had screenshots of exactly where to hit the wall on my old computer but not on my new one unfortunately. alot of the frag videos on here (Unwonted, Dark Files, LSD Cal Frags, Poconut's short video) have examples of this shot so watch those vids.
I honestly don't think those are necessary, but you can do what you want. (Obviously)