They are correct. Learn simple maintenance, get a real Helms shop manual, get a Haynes or such simple maintenance manual, get an owner's manual. Read them, and start out.
I changed my first two barrel to a four barrel on my Mom's '55 Ford Coupe when I was about 14. By 19, I had a '55 Chevy hardtop with a 348 and three dueces. I rebuilt the 3 speed trans three times that summer! After that was stolen, I got a '63 Chevy II, 194" 6 cyl. I change the rear, put in 4.56 gears, put 14X7 and 15x8 wheels. When that engine blew I put in a 332 small block, with a Crane cam, '65 Corvette Fuelie intake, fenderwell headers, Turbo 400 trans. Wow, what a rocket. It weighed 2700 pounds. All done by myself, except the motor rebuild. Went to sleep for 25 years, and got my first Vette a year ago. Its like I was reborn. Just today, I was outside doing Fall yard work, saw the Vette, and said to myself, yikes, I can't believe that I have a Corvette!.
Anyway, read, read, start out slowly, get dirty, have fun.