Unfreezing and getting motivated for the change is all about weighing up the 'pro's' and 'con's' and deciding if the 'pro's' outnumber the 'con's' before you take any action. This is the basis of what Kurt Lewin called the Force Field Analysis .
Force Field Analysis is a fancy way of saying that there are lots of different factors (forces) for and against making change that we need to be aware of (analysis). If the factors for change outweigh the factors against change we'll make the change. If not, then there's low motivation to change - and if we feel pushed to change we're likely to get grumpy and dig in our heels.