Sorry there have been 10 pages and I cant read everyone's suggestions
However I have to train people in using a system. Abilities vary and how teaching methods.
Some need to do it themselves as I train
Some can just watch what I do
Some need written manuals with just text
Some need written manuals with pictures
Some can follow a video
Some can just do it without any support
No one is more or less daft as the previous just their brains are wired different.
Your dh will get frustrated as he can do it and unless you are used to training it's really tricky to be patient when you can just do it.
I would suggest do some simple tasks
On word, create a document, copy some text from a magazine or a letter you have received. Save the document as a new name, if you can print it and email it.
Once you have done that close the document.
Now try and find it again. (Best thing to do is save to desktop)
When you find it try and do some editing. Highlighting the text, play with font changes, size change, underline. Doesnt matter what you do.
Save as a new name.
Do this process several times. The rule is normally 10. Do something 10 times and it starts to create synapses in your brain to recall what you do.
By doing it with a meaningless document the pressure is off and you can get it wrong without worrying.
You can then do this with excel to.
Once you have finished messing about try and write out the contents of your freezer, all of your utility companies. Family and friends birthdays. Things that have real meaning to you.
Video calls ask a friend or your dh if you can practice with them. When it doesnt matter and you can fiddle and play with buttons without any pressure.
Dont worry about how long it takes you but most jobs now have some form of tech involved so you are better off practicing at your own speed and building your confidence now so you have it in your pocket ready for when or if you decide to return to work.