I'm on my 4th time starting a round.
It's not as easy as it was 20 years ago.
Too many windies around, too many redundancy start ups.
I think you'll find the successful ones have one thing in common.
Self- confidence and self-belief.
After working in an office for 20 years this attitude tends to be worked out of you by the "system".
If you lack confidence tend to be shy, timid, or think things through too much.
Go out and knock doors and ask if people want a window cleaner.
You don't have to buy any gear, you don't have to clean any windows, you don't need any leaflets or transport.
After a week or so you will know whether or not to go ahead.