Simplify your desktop - close unnecessary windows.
It's helpful to have 2 monitors. In the Zoom desktop app, use settings to designate 2 monitors. This can be nice for PowerPoint so you can see speaker notes in the 2nd monitor.
If you have a second device (iPad or laptop), you can join the meeting from it to see what students see.
Open the meeting early.
SHARING
If you will be changing applications, share the whole screen. Otherwise, only share the relevant application.
Have some water handy.
PRACTICE with someone until you are familiar with all of the settings.