I was also scared of taking a cut in salary, scared of what my family and friends would think, and scared of losing the status I'd worked so hard to achieve. Don't overthink it; just write down your thoughts.
Hastings wondered "How come movie rentals don't work like a health club, where, whether you use it a lot or a little, you get charged the same? I want to share my delicious recipes with as many people as possible! Getting an idea can be as simple as keeping your eyes peeled for the latest hot businesses; they crop up all the time.
At a certain point though — and this is scary — there is no one to ask permission from. Some will envy your courage; others will resent you for having the guts to actually do something.
My initial approach was to come home from work, wrap myself in my bedding, and go round and round in circles in my head analysing what else could I do. Think of your career change as an expedition, not a day-trip.