No, don’t give up! Now that you have the gantry and the XZ/YZ plates all assembled, you’ll find that the rest comes together really quickly (at least I did)
For wiring instructions, follow the steps in the SKR wiki page. SKR Pro - V1 Engineering Documentation
There may be a few things that aren’t immediately clear, but most of your questions have probably already been raised in the forums (for example, see New 2 CNC start* LR3 build - #72 by adammay5 and subsequent replies for info on wiring the steppers), and there are lots of members here to help you when needed.