How do you know if you are on the right path in getting a PhD? How do you know if your study or your dissertation is "good"? The reality is that you don't know- all that you can do is keep going, one step at a time. You will get a lot of feedback and advice along the way to your PhD, some you will be required to take to continue, other advice you will have to make your own decision about whether to use it or continue in the same direction. Don't let the decision making lead to a fear of movement, rarely is any decision fatal or unresolvable. One step at a time… keep going.
For many students the freezing in the headlight moment comes when they
get the URR review and yet more changes are required. I recommend reading the
review then setting it aside for a day. Resist the temptation to start criticizing
yourself, everyone has revisions this is just another hoop to jump through. Instead,
think of it as a problem to solve. Lay out how you will approach it, and take
the comments one at a time and address them. No, you do not have to take every
suggestion or comment – but you do have address them. So if you disagree, use
track changes and respond to the reviewer why you have chosen to not change the
item. Also, realize that the URR may disagree with you and insist on the
changes. Is this thing really worth holding up your progress? If you answer
that no, then change it, and move on.
Some students get hung up on the idea that their dissertation is
"theirs" and they do not want anyone else's advice and refuse to make
changes. PLEASE, give up on this idea. It is not "yours" it is your
dissertation committee's paper and you are just a member of that committee. Your
committee's names will be on the paper as well as yours (check out the Walden
library's dissertation database, if you want to see). Their job is to make sure
that your paper will get through the process, don’t waste time with ownership
issues, move on.