Leadership certainly involves setting direction, but the best vision can be undermined by taking away the 'how'.
We humans want some sense of control over our lives. That often comes from freedom of choice about how and when a job gets done, responsibility for the success or failure of a project, or even freedom to interact freely across the entire organization.
When offering up a plan (the 'what'), be sure to leave as much of the implementation ('how') as possible to those involved.
Think about this:
We hire people because we believe they offer a unique talent. That uniqueness lies in the 'how' they go about doing things. Once you take that away, you've taken away who they are at the core and why they signed on the dotted line. When you take away people's choices they'll begin to find ways to undercut or disengage from a project.
Give people opportunities to choose and control. You'll become the master of engagement.