For every 999 people that have confidence in their ability to market your property, you only need one person that is competent.

And you only need one word to describe Bill Warmath:
competent.

If you need more words, then:
{skilled| proficient| qualified| experienced|
seasoned| capable| knowledgeable| reliable|
skillful| expert| certified| highly trained|
professional| efficient| effective|
dependable| suitable| trained| educated| complete|
polished| up to speed| up to it|
on the ball| fireball|
know the answers| know the ropes|
know the ins and outs| fit| paid one's dues|
dynamite| savvy| adaptable}