If you are like most of us you won't be be overwhelmed you'll be addicted and looking for every spare moment you can to work on it.
Don't worry about getting things wrong- the pros were not pros the first time they tried something. I just look at some of my adventures as the "tuition costs" to learn.
The hardware store can be your best friend , lots of things for Airstream are found there.
Finally, the words " I have an older Airstream" and "can you help me with this" are often magic as people are fascinated with Airstream and will often go out off their way to help you solve a problem.