You cannot take the risk of doing business with lawyers unless you are a lawfirm. They will either sue you or not pay their bill and invite you to sue them. Leave them to legal specialist firms that have lots of lawyers of their own.

Doctors are also a problem, not that they'll sue, but they're simply incredulous that anyone but a doctor expects to be paid higher than minimum wage. If you're firm with them, and they still deal with you, they can be very good clients. You just have to get them to conceptually lump you in with suppliers of (always horribly overpriced) medical equipment, rather than with employees.

Both doctors and lawyers like to screw around with the equipment. They think expending their own $200 to $400 per hour time is a good deal, because that consultant is so expensive.