What is has done has taught me not to be afraid to stretch myself, to never let my inner killjoy to stop me from trying something new or taking one step further than I have before. And this has also been true with my writing.
I believe that the word no shouldn't be in a writer's vocabulary. One of my first instincts, when asked to write something or to approach a new market with an idea would have been in the past to say no. I would convince myself that I couldn't do it and that there were loads of other, better writers out there than me who could and would do it to a higher standard than me.
Today I think that's hogwash! Yes, there are lots of writers out there but just because there are lots of writers doesn't mean that they can write better than me or you. Writers have to push themselves now and then even when the risk of failure is high. It's good to take ourselves out of our comfort zone and take that risk. Yes, many rejections may come but the mark of a true writer is someone who accepts rejections for what they are and learns from them then moves on and writes some more, implementing what they have learnt. For me it's the only way forward.
So banish the word no from your writing life and take up that challenge, pitch that idea, approach that agent or publisher - you'll never know if you don't try.