pixie - not everyone is doing brilliantly. I don't think I am particularly. The week was really busy with work and I've been so tired this weekend. I've done a few essential things like food shopping and I went out for a meal yesterday evening and to church this morning but apart from that I've spent most of my time sleeping!
I did end up doing an unscheduled sort of the cutlery drawer in the kitchen. I moved the cutlery tray on Friday night to rescue something that had worked its way underneath, to find that the tray was stuck to the drawer by some unspecified brown gunge that looked as if it had been there for a very long time! 
I ended up taking everything out and dumping the tray and cutlery in the dishwasher and using washing soda to clean off the gunge in the drawer as ordinary kitchen spray wasn't cutting it!
Still it did mean I found three forks to de-clutter. (Unfortunately not four candles!)
I took a bag of bric-a-crap to the charity shop on Saturday and a few things to go in their rag collection.
Grandmaw - with respect to coming in useful "one day". Sometimes it helps me to be more specific - which "one day" do I mean? How many "one day"s am I likely to get in all honesty and will I really want to spend any of them doing x - in your case - watching such and such on video.
The other thing I'm finding handy is to not let the stuff I don't want to part with (with me - mostly stuff that may ( or may not) come in handy for future unspecified craft projects) get in the way of ditching stuff I am willing to get rid of. So just because I'm hanging on to some pictures from Junior Education magazine from the 1960s because I like them and they make me think nostalgically of childhood - even though I have no idea as yet where or if I will display them, that doesn't mean I can't get rid of 3 forks from the cutlery drawer.
Ok, the 3 forks aren't taking up much room but I'm finding that decluttering breeds decluttering (sometimes). Start with one or two things and you feel like doing more.
Paradoxically for me. telling myself there are "no rules" and I can hang onto stuff if I want, is actually helping me to set up challenges for myself. I'm aiming to get rid of 365 things more than I bring into my flat this year. It's harder than you think but does send me off searching for other stuff to ditch!
Another thing I'm finding good is to slowly re-locate things to store them as near as possible to where they are being used. I've done this most in my bedroom so far and things are so much handier and more likely to get put away now. As you go through drawers etc re-locating it makes you question what you really need and you do get rid of bits of crap. You can always start with crap removal "lite" and go back to do a deeper purge later.
By the way - with respect to videos. I think even charity shops aren't that keen to have them at the moment cos they don't sell well.
Could you challenge yourself to get rid of a certain proportion of your videos? So say you have 100 of them, could you decide you will get rid of the 10 you like least and are least likely to watch. Or get rid of the 10 music cassettes you think you are least likely to want to listen to again! Are there any that remind you of difficult/sad times in your life? I'd suggest those should be the first to go! You will feel so much better emotionally if you can start to get rid of stuff