Law Practice Today focuses on the fit between an attorney and a client.
Dee Crocker writes (excerpt):
The most important rule in getting paid is selecting clients who are willing and able to pay for your time. Otherwise, you may find yourself providing pro bono services on cases that you accepted because you expected them to generate fees. Carefully screen new clients to minimize the number who don’t pay for your services because they cannot afford your fees. Discuss fees with your clients at the outset. If you find they are unable to pay for your services, you can make an informed decision about whether you want to assist them pro bono.
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Avoid clients with unrealistic expectations. The client who complains about everything, who demands constant or immediate attention, or who expects extensive hand-holding is usually the client who is never satisfied, especially with your bill.