what he said ^
but yeah, if I (a 14yr dumby (okay, I'm kinda smart)) can do it, you sure can too!
and, I'll help out, and everyone here likes to lend a helping hand as well.
honestly, just trying stuff is how i learned. I've built a Traxxas Mid-motor Rustler on a Nitro rusty chassis. It's great to just try stuff out and reap the rewards. A kit could be great. With a kit you learn about the car you're building.