Cut 'n' trim 'n' paste in small areas is about all I can offer as well.

I would possibly invest in a shrinker-stretcher if I had too many convoluted bends:

2-in-1 Metal Shrinker / Stretcher

Eastwood 51088 Eastwood Shrinker/Stretcher Combo Set

Dang - here I go, helping Randy spend his money --- again 8-}