Especially if you are using camo pattern. But I also see it as a challenge.
The most difficult areas are the engines with the cowling's, the rudder it self when you want to that painted in own colour. Some of it is even mirrored to different places on the plane. Also the canopy at the bombardier/frontgunner was a bit tricky with the overlaying layers, but that I have solved

.
I have come to a stage where I make only small changes and then copy the bmp into the sim. Check it out and takes screenies of the error places, then back to CS2 and try to correct and so on, back and forth

.
How long time it will take before I'm finished, I really don't know.
A B-25 in 2 colours only would have been much easier

, but that I have done.