Screencast-O-Matic: my first attempts

Yesterday I made two screen casts using http://screencast-o-matic.com/screen_recorder
 I wanted to try it out and see if I could use it for my project.
 I identified what I wanted and found some relevant 'bits' before practising what I was going to do. Then I wrote the script and 'went for it'!
... a bit anxious about it at first. I found that it was hard to stick to the script and to do the actual instructions at the same time - it would probably help if someone read the script and another person followed the instructions (the visuals).
I made a couple of stop starts and am wondering if I need to do some edits. I have Adobe Premier but am not sure how to edit the audio ... was thinking that I could copy the audio into Audacity do the edits and then paste it back into the MP4. Haven't tried it yet so don't know if it will work.
Then there is the problem of accessibility. One was 11 minutes long - I could upload it onto YouTube.