I generally counsel folks that they should consider their first frame practice. I'm sure it's possible for a first frame to be useable, especially if made by someone with prior metalworking experience, but on average, I'd bet that most first frames end up hanging on a peg.
I also expect you'd find that by the time you've assembled all the tooling and materials necessary to have a good shot at building a useful frame on the first try, you've spent enough money that you could have just bought one in the first place. Getting into framebuilding to save money - unless you are looking to replicate extremely rare and/or expensive frames - is probably foolish.