Although I still watch YouTube videos (using Freetube on desktop, Newpipe on mobile), I recently joined Nebula.tv + curiosity stream.

You can also practice these whilst being stationary. Get on your bike and lean against a wall (your shoulder touching the wall giving you support and preventing you falling over). Don't clip the foot on the other side, just in case you lose balance.

This way you only need to focus on clipping in/out without having to worry about falling over. This will hopefully give you a bit of confidence before going out on the roads again. :)