Effective teamwork starts with trust amongst the various individuals one-on-one. It is nothing that can be forced on them, however, great leaders give their people multiple opportunities to develop strong relationships over time. When they really feel like it, they will also tell somebody on their team that they trust him/her. This is not only extremely motivating; it also helps to build the loyalty needed to succeed as a team.
You’re under pressure because you definitely started this important project too late. How