Packer is an open source project with a growing community. There are active, dedicated users willing to help you through various mediums.
#packer-tool on Freenode
Announcement list: HashiCorp Announcement Google Group
Discussion list: Packer Google Group
Community Forum: Packer Community Forum
Bug Tracker: Issue tracker on GitHub. Please only use this for reporting bugs. Do not ask for general help here. Use IRC or the mailing list for that.
Training: Paid HashiCorp training courses are also available in a city near you. Private training courses are also available.