And Another Thing.....
One more thought about taking time to "celebrate wins" during tough projects....
Don't forget to include the SMEs (subject matter experts) from the business. They're tasked with helping your team define new processes, test the system and sometimes even deliver the training - while at the same time doing their FULL TIME jobs!
As a project manager, make sure you take the initiative in recognizing their contributions as well and recognize the additional workload and strain that they're under.
The occasional joint celebration (IT team and SMEs) helps recognize everyone's contributions and helps with team building as well.