That's really good advice. I'm on my second attempt and I'm trying to draw on what went right last time, but to stay away from the choices I made which undermined that. It's also very easy to be hard on yourself if you slip. I certainly was - I felt I'd let myself down and spent more time focusing on "I can't do this", rather than, "You managed to do it once and you can do it again, armed with a better understanding of what it takes to keep doing it".