Hi !
I don't think there are any tutorials on here, I'd have to refer you to fiberglassforums.com for that. It's not too complicated; if you can cook something simple, you can do fiberglassing. There are basically just three ingredients. If you put too much hardener in the resin you lose that batch pretty quickly, and if you don't put enough, it takes longer to cure, so you can't screw anything up, you just readjust the next time.
Try this "tutorial" to give you a good idea.
The best way to do mods in fiberglass would be to start by making a "plug" (basically the shape you want but made out of cardboard, duct tape and body filler). Then by laying fiberglass on that part you make a mold. Then using your mold, you make your final part.
And something I can't stress enough, you need good protective equipement, especially a respirator and a long sleeve shirt when you're sanding. I hope this helps, someone else can chime in to add more tips.
