Here are some of my suggestions for going full time. I learned this from my own experience.
1. Do not base your financial plan on averages. They don't exist in real life.
2. Therefore, do not expect to draw down to pay for living expenses on a monthly or even quarterly basis. Plan on longer term. Otherwise, you will be putting yourself under too much psychological pressure. You won't trade well. For me, I do it once a year - ie I do my accounting and re-allocation of capital and draw down for expenses once a year. Yes, that means I must have at least 1 year worth of living expenses set aside in the bank before going full time.
3. Do not put 100% of your capital into options trading. I recommend no more than 50%. I personally do much less. No matter what others tell you, options trading is risky. No... you cannot completely hedge off the risk regardless how sophisticated the scheme might seem.
4. Have a separate portfolio that generates a stable income to ensure your worst case isn't zero income. This can be based on high yield equity, bonds, rental, etc... just not another options based portfolio. Even with a yearly draw down for expenses, there will be times when your return is zero or negative. You want a safety net.
5. Another thing I found really important - before I went full time, I thought I could practice trading a small account, $50K or so, prove to myself I could be consistently profitable over a period of time and then the rest will be easy. I could just scale up my capital 5x, 10x when I go full time. Nope..... Doesn't work that way at all. Trades that I could do with $50K becomes psychologically impossible when I'm trading $500K. And it's not like you can be more conservative and just adjust earlier in hope to get a lesser return based on the same trade. No, once it's beyond your psychological profile, the trade might go from positive to negative expected value. Adjusting earlier or putting more hedges could break the trade completely. At the end, I had to re-learn another trade that works for me psychologically with large capital size. Therefore, it's important that you find out what strategy works for you at the capital size that you intend to trade before you go full time.
In summary, I think the biggest obstacle for trading full time isn't an intellectual but rather psychological one. Therefore, we want to give ourselves lots of financial buffers and also find a trading style that go easy on ourselves psychologically, at least in the first couple years. After you're in it for a while, you can choose to be more aggressive if you want. Otherwise, I think the failure rate can be quite high.