If you answered yes to both questions, then you can consider not selling your RSUs. If you answered no to either or both those questions, I would strongly consider selling enough of your vested RSUs to turn those into yesses.
If you need to sell a significant chunk of your RSUs to reach those targets I would suggest you to take a good look at your current budget to figure out why your savings and investments are not on target.
Also, do you have any experience with dealing with a large drop in value and do you _know_ based on that experience that you'll be able to sit tight when such a drop inevitably will happen? Because if you don't have such experience (or worse: you know you're unable to sit tight), chances are you will be part of the stampede in times of panic. In that case consider selling 'more'.
Lastly, what would you suggest your best friend do in your situation?
I agree that it can be hard psychologically in a high-growth industry like tech.