fiberglass is WAY easy. That is why you got a 15 minute course.. because that is about all there is to it.

I can pass on a couple tips for ya though:

VENITLATION. very important, those resin fumes will burn your eyes and lungs.

rubber gloves.. keep a box handy. Change them out as often as you like. Makes things lot easier when you don't have fuzzy fingers.

mixing containters: I like to cut the side out of a quart oil jug for small jobs, or cut the side out of an antifreeze bottle for big jobs. You can even re-use your mix container. just let the resin dry, and flex the bottle, the old resin will pop right out.

Bondo glass kit, recommends soaking the glass in resin, then applying. I don't like that method. Too messy, and the glass will stretch. I like to use a disposable ( dollar store ) paint brush, and brush down the area with resin. Then, lay the glass down on the sticky area. For covering holes, window screen works well. Otherwise the glass will sag. Then I use the bondo spreader to apply the resin. Easy stuff.

Of course, it sounds like you want to remove the glass from the panel after it's formed. To do that, you will have to use some form release spray, wax, tin foil, or whatever. I've even heard of people putting air bungs in the form, and then using compressed air to release the form.