could be tricky, the money and happiness thing seem mutally exclusive unless you are very lucky.
I am property developing now on top of my job. I should clear around 90k from the 1 job. This will allow me to stop the job i am doing and move into flexible working (change of career not decided yet). I need to do this 2/3 times to ensure i have enough capitol behind me to free me up and enough i can borrow capitol with. I can go to a venture capitalist and get some fairly heavy dough.
This is my plan, as it will ensure that i have both (he hopes). I am 29 currently.
Take a gamble, get some mullah behind you and then go for it, especially if you have bills and the like.