Drum to Disc conversion

Switching to LBP and front disc on one car but on the other I was thinking of going the scarebird route as it is a more "finished" vehicle and I don't really care to swap axles and get new wheels and such. Can anyone in the process or who has done this tell me in all honesty what the biggest pain has been. I've heard its a lot more grinding and trimming then you are lead to believe. It would be going on a 69 barracuda with front 10".