@BumbleBeeBoogie,
Virtually no 'gardener friend' will tell you to hire a contractor. OK, maybe, once in a while.
He or she may or may not be correct. Nor... will, necessarily, be the contractor.
Some contractors are idiots and or money makers. Alternately, some are very astute - some very, very astute. There has been a mild pulse on this in california, re state boards.
Still, there are appropriate practices. Please do some online investigation.