Do you wish to save time writing out instructions when you can create a screen capture video much faster.
Screencastify is a simple video screen capture software (aka. screencast recorder) for Chrome. It is able to record all screen activity inside a tab, including audio. Just press record and the content of your tab is recorded. So you can easily create a screencast for video tutorials, record presentations etc. It also supports desktop capturing, allowing you to record anything on your screen (not just tabs).
Video recording happens completely locally. So your recordings are not transferred to any remote system unless you choose to upload them. Your video files are stored on a sandboxed local HTML5 file system managed by Chrome. When choose to store your recordings on Google Drive, they are uploaded to your Google Drive account after recording and removed from local storage. This helps to save local storage space, especially on Chromebooks and allows access your recordings from other devices.
The free version allows to record videos that are 10 minutes long. This is way more then you need. To record longer videos, it can be upgraded to a paid version (see https://www.screencastify.com/buy for details).