I'd suggest networking, and not feeling afraid to add fellow modders and ask questions if you're stuck. Not all of modding is easy sailing however, you may come up against roadblocks that consume hours of your time, until you inevitably tweak a single value and it all starts working perfectly.
The skills it requires are an ability to problem solve, determination and being able to commit time to a project. Before we begin, I'd like to reassure you that modding truly is easy. This guide will aim to teach you the very basics of how modding works, primarily through the use of the Assembly Kit and the Pack File Manager.