Welcome aboard.
I'd wager most of the forum regulars here are self-taught, or at least picked up the bulk of their initial knowledge from internet or printed resources, myself included.
If you're a practical, hands-on kind of person, you may find it logical in the short term to just dive in and have a go. I'd suggest taking on a smaller project for starters and build up from there - say put a cheap kit guitar together, or construct a body for a premade neck you may have lying around. Once you have some basic experience, you can progressively up the ante with your builds - make a neck from scratch, buy a kit guitar and pimp it up, experiment with different materials. As you start to build more you'll probably find that the increase in difficulty will necessitate the inevitable increase in expenditure on tools, so if you're keen to stick at it expect to invest a sizeable chunk of cash into the equipment required to machine and assemble your projects.
A generous work area to spread yourself out in is always handy, but not essential. Some of the guys here have built amazing instruments on the balconies of their apartments.
Buy lots of clamps.
Building guitars can be dusty, noisy work. If you're using power tools make sure you have all the right safety gear (safety specs, ear muffs, dust masks). Learn the correct and safe usage of high-powered cutting tools to prevent any messy accidents.
Clean up after yourself frequently.
Be prepared to make mistakes. Look for ways to turn mistakes into an interesting feature.
You may even find that you get more out a luthier's course after having spent some time building under your own steam.