Glenn you need help!!!

You really don't need a cutting compound to learn with
Your gonna rub through!!!

I'd try 3M Finnesse and slow things down
A lambs wool will cut quicker but you'll get a lot of swirls/ holograms
If you use foam it'll reduce swirls but the heat of the panel will be considerably hotter
Hot panel will speed cutting and increase risks of rubbing through and burning the paint

You'd be best of buying a DA first, get used to that before rotary
If you want alittle help
You could always pop down here for the day

Don't mind giving you alittle training...