new business
Here's some problems you may encounter, so you should work out the answers beforehand.
I can make $75/hr as a handyman and wonder when my phone will ring for the next job. Advertising is double-edged sword, so I don't advertise; my customers are by word of mouth. My income each year varies 100%, either plus or minus.
Or, I can make $11/hr working 20 hrs/wk, guaranteed, in a hardware store, and gamble on getting a really bad supervisor who rightfully belongs in a Dilbert cartoon, and pursue handyman stuff in the remaining time (assuming I have enough energy left after the hardware store).
I thought $11/hr was peanuts, but to my surprise I did the second choice anyway (at least till I got Soc. Sec.). The "heat of battle" can make you do strange things.
Now, on to your conscience: if you read the papers lately you'll know that there is almost nothing that cannot be accomplished by deception. And just as sure as E equals IR, the more deception the higher your income, absolutely positively guaranteed.
"Smooth dudes" and "players" make money.
This is another decision you should make beforehand. Then see if you can stick by it.
Also, I had a well-recommended guy install windows in my house. From his size, his demeanor and his beard, I'd swear the guy just got out of prison. The customers have to be comfortable with you, for repeat business.
How will you apportion risk? Fairly, the customer is paying you to assume the risk of unforeseen events, but I've never seen a contract that did this. And the remodeling magazine I get even said that "who gets to bear the risk" is a hot potato which fact is, and must be, hidden from the customer.