Plumber who has to do his own insulation

[Gh0st]

I am a plumber only I've mostly worked at a company who subs out their insulating to outside companies. (i.e. hot,cold water, condensate, heating/ chilled water) I can insulate straight pipe an 90°/45° an make it look good on the outside. But I am not a fan of trying to figure out how to cut the rigid fiberglass insulation to fit properly on anything other than straight pipe or 90°\45°. Any and all help will be appreciated fully an to show our other plumbers how to insulate properly.