There’s always a thought that you could do more.
- One more experiment before you write up.
- One more section before the chapter is done.
- One more paper to check or question to answer before your viva.
Before you ask yourself if you’re ready, maybe ask if you’ve done enough.
Before you ask yourself if you’ve done enough, maybe define what enough would be.
Enough research, enough of a thesis, enough prep for the viva.
Decide on enough, so you can confidently answer “am I ready?” when the time comes.