Most battle profs I see at fild, either just stand there and hope they can fight someone w/o GTB or go stave crash. I have not seen much people die by prof. bolts or bolts in general unless its from a baby class or Biochem.
I used to play prof myself, but as I got more into PvP or just "pk-type" games in general I realized my offensive capabilities were being diminished. I eventually ended up just using prof. to make scrolls for fellow guild mates but then ended up quitting the job all together to focus on Biochem.
Side note: If you plan to play prof. for fun then by all means go experiment with the job. I tried to play sniper for a month or so and got bored of FAS. So for fun I would have a dagger with double attack (hopping filir) Ifrit rings, and take advantage of Arrow Repel (gear switch) and Anklesnare. With a sinx card, I would go to fild, not to kill but to make the job a bit more refreshing to me and everyone there. :)