So if i use the next half year or so, learning about the 4 different points you mentioned. Would you think i would be able to do it? If so, do i need a real garage with all the fancy lifts to do it?Assuming you have a 370Z in working order and a computer with a CAN interface, you can learn quite a bit through a combination of online and experimentation.
You can also learn a lot about electricity and wiring with some simple kits combine with on-line stuff. Mark-Rober's engineering courses would be be good place to start and safe.
Basic mechanical skills are picked up over time and practice. Get an old car that doesn't run and make it run.
Welding is mostly practice. No amount of on-line learning will substitute for holding the stick and 'stiching' the metal together..