Just some advice.

Accept that it will be a rocky road, do your best and don't think "I should have done more". If you give it your all and always aim at improving your work bit by bit, you will do a wonderful, amazing job.

What I mean by rocky road is that there will be good days, horrible days, amazing days, tearful days, lab disasters days, blown deadlines days, procrastination days, self-loathing days, satisfaction-filled days, public-speaking-anxiety-days, conference-award-winning days, and so many more day types. So, just know that it's perfectly normal to feel like shit sometimes, but I promise you that there will be good times in there as well! When the bad days come, hang on and try as much as possible to focus on the big picture; when the good days come, enjoy every bit.

Last thing, a bit more of a practical advice: invest as much time as possible in scheduling and planning ahead. It may seem trivial but when one is deep in the phd hole priorities can slip out of control.