Think hard about whether there are people you haven't met who are likely to be critical to your success.
The first step is to be clear about why you need the support of others. Start by thinking about the alliances you need to build in order to secure your early wins.
Who are the key decision makers?
What do you need them to do, and when do you need them to do it?
Which decision makers are essential for things to move forward?
Think hard about potential blocking alliances.
Senior decision makers usually are influenced to a significant degree by the opinions of others on whom they rely for advice and counsel.
Ask your manager to connect you to key stakeholders. Request a list outside your group whom they think you should get to know. Then setup meetings with them.
Notice whom people go to for advice and insight, and who shares what information and news.
Try to identify the sources of power that give particular people influence in the organization.
Assess intrinsic motivators and situational pressures:
Consulting promotes buy-in, and good consultation means engaging in active listening.
Keep in mind Aristotle's rhetorical categories of:
Is about influencing how people perceive their alternatives.
Is the impact of the opinions of others and the rules of the societies in which they live.
The knowledge that a highly respected persona already supports and initiative alters others' assessments of its attractiveness.
Decision-making processes are like rivers: big decisions draw on preliminary tributary processes that define the problem, identify alternatives, and establish criteria for evaluating costs and benefits.