I have only 52 missions under my belt but concur with Gum; the first couple are the worst. Not helped by the fact that I was hit by 20mm HE at 150' over the target on the very first mission. I have extremely vivid memories of rounding Mount Low at 50' to see a firestorm of ground fire and missiles coming my way from the airfield at Stanley. I was scared for about 6 nano-secs before the training kicked in and I found myself flying at 10' AGL and 480 kts. Seemed safer down there, somehow.
The only other time that I really felt scared was in the wardroom bar, in anti-flash, with a half-empty pint, knowing that an Exocet was due in 30secs and there was cock-all that I could do about it. I did feel very angry on occasions though!
The brave guys were the ones who were scared witless and did the job anyway.
Mog