Ditto what Karl and Bert said. Take your time and focus on one area of the bike at a time, not the whole bike, that way the job is not daunting or overwhelming. Make a list of the work the bike needs, and using the online Parts Book, make another list of the parts you will need. i don't know what your budget is, but assuming new wiring harnesses are available, my suggestion would be to purchase one. Regarding the chassis, pretty much anytime an old bike is resurrected from the grave, it will need a dismantle, cleaning, and then new grease in all the moving pivots, joints, e.g., swing arm, steering head, brake pivot joints, cables, etc. As you dismantle, lay the parts out in their order of assembly in a thoughtful, orderly manner; have a place dedicated in your garage where the parts can rest undisturbed as your work schedule permits time to work on the bike. Know that projects such as these are not instant gratification, and that such projects require patience, persistence, and asking questions for the things you need to learn how to do. if you approach the project with this sort of attitude, you will have the opportunity to meet some extremely knowledgeable folks on this site who can save yo unnecessary brain damage, and when you are done with the project you will have a sense of accomplishment such as you've not experienced before. the first time you start the bike and hear it run, and go for your first ride will be like none other.