Just a little free advice: (Worth exactly what you paid for it
Step by step, do one thing at a time, so you can concentrate on it, and do it right.
Decide what you need to do, then learn about it, get your supplies & tools together, then do it.
Example: These things seem to run on vacuum as much as fuel, so if you're going to go through the vacuum system, get a GOOD, CORRECT diagram, some tubing, some fittings, take a day, and do it. Have the GF hold the diagram and hand you tools, if necessary. She might enjoy it. She might run screaming, too, but either way she'll know where you are and what you're doing.
Next 'project', she'll either help, or get out of the way.
You might want to invest in a box of latex or preferably nitrile(blue) disposable gloves in her size. They'll keep her hands and nails clean, which may let her be more amenable to helping. I use them all the time when I work on the cars, and it makes the cleanup a lot easier.