update videos

When I upload my first few videos and later want to tweak the calls to action or use other calls to action - is it possible to actually trim out more than 20 seconds or add more audio/video content to the running time with Enhancements? If this is not possible could I add some extra credit roll...

Hi everyone!! If you follow my channel (you should! Lol) you know my son and I had a huge argument.. Find out what happened since then and where he was this whole time!

I'm wondering how important people think it is to communicate changes to your subscribers? As my channel's still small and growing I'm constantly trying new things and experimenting and I'm wondering how important people think it is to make little 'channel update' type videos to explain things...