Unless you have VERY VERY good connections in some airline, and when I mean very good, I mean the good that guarantees you a job as soon as you finish training, then DO NOT DO IT! You must be insane even thinking about it...
Ask yourself these 3 questions:
1. Do I have good connections in some airline?
2. Do I have a laaaarge amount of money just sitting around?
3. If I decided to do it and then can't find a job, will I have even more money sitting around to go do a type rating?
If you answer NO, to all of these 3 questions, then I would HONESTLY, SINCERELY and TRULY suggest that you do not even think about this again.. Because you WILL destroy your life, and your families...