If you hire a marketing agency, one of your first and most crucial challenges will be learning to trust in their expertise. It can be tempting to roll up your sleeves and want to understand every intricacy of their technology or their tactics, but you should instead try to stay at the strategic level. If you get bogged down in wanting to know all of the keyword variations your Google Advertising expert is using, for example, you just wasted a lot of time that would be better invested elsewhere.