Melody you have a lot of fear right now because you are facing things you don't know how to do or even what it is like to do them. Why not try to get rid of some of the unknown without attempting the actual repair?
Have a crafty play day with a small fiberglass repair kit.
Head to the hardware store or auto parts store. Buy a small fiberglass repair kit that has resin, hardener and some cloth. Get some gloves too and a couple of stir sticks, one of the small yellow spatula type of spreaders used for fiberglass work. Take an old object you don't care about such a plastic storage box with rounded edges or some container and cover it with the materials from the kit. Follow the instructions on the label for mixing.
I hated fiberglass when I first started working with it and it frustrated me, I don't enjoy working with sticky messy stuff to begin with. But then one of the professional repair people in my neighborhood taught me a trick I use often and that has made it much easier. Cover a board or other work surface with some plastic sheeting. A cut open thick plastic garbage bag will do just fine, tape it down so it does not move. Cut a piece of the cloth. Lay it on the board. Spread some resin on it. The cloth will turn from white to looking more translucent when there is enough resin on it. You don't want it to have so much that it is dripping off when you pick it up. Now drape it on the object you want to cover and smooth it down.
To reduce the stress of learning a new task try to relate the job to other task you may have done before because there are some similarities there.
Have you ever made lasagna? Flat noodles covered in sauce
Have you ever done paper mache with newspaper soaked in glue?
Have you ever frosted a cake?
Have you ever used sandpaper?
Very few of us reach an adult age without having done crafts as young kids at school or camps or having spent some time in the kitchen.
See ...you already do have some of the experience that will help make it easier.
If you do decide to delay the repair until spring you will have time to practice your skills. You can buy a whole bunch of fiberglass materials to practice with for the cost of a half hour worth of labor at a repair shop.
I had a hole 3 inches long in a complex curved area on my trailer to fix, it was not that difficult to do but it took some patience and thinking it through and some sanding and extra filler and more sanding. But mostly it just requires patience to take the time to get the surface just right rather than actually needing a lot of technical skill.