Once you have the hood off, you are done with the hard part.
All you need to do then is soak the nib and collector in water for a day or so (just to be safe). Then pull the collector assembly out of the barrel with a slight twist. Heat is usually unnecessary. The collector is supposed to have a slit in it, so what you think is a split may just be the slit to provide ink to the nib. The nib and feed can then be pulled out of the collector. Pull straight out without twisting.
Thank you!
Soaking starting now.