For the sake of discussion, I am going to say not to go full time first.
I'd spend time immersing myself into areas which will help my career before taking on 4-6 months of expenses. I don't think it will be too difficult to learn through others via mentors, networking, meetups, training, reading, conferences calls, social networks, etc. I can take advantage of all of that and not worry about needing months worth of living expenses on the chance that I can make a living at some point in the future. Find a part time job or volunteer in areas which put you in front of people you can leverage in the future.
Analogies. If you want to be a day trader, you either demo trade till you prove yourself or you open an account with a small amount you expect to lose as "tuition" cost. You don't quit your job and learn while losing all your money. The same can be said about playing poker as a pro.
Now my frame of mind might be because I have a family to worry about and I am limiting my risks. I could be thinking of jumping in when I have no other responsibilities. However, I think making calculated decisions and running things like a business is the best way and stage of life having little to do with it.
Just my two cents.
Eric