Be prepared to fail
Being a blogger isn't easy. It is very easy to get started on a new blog or website and then forget about it for months and months until the end of time.
I've made the mistake of starting and quitting too many times to count.
However, I've learned to never quit. It's important to have a good idea and vision for your site or blog, and stick to that vision through thick and thin. I started and failed a few times. It wasn't fun, but every time I had a go I learned something and eventually succeeded.
There is never an excuse for not being prepared. There will be failures along the way, but you need to keep moving forward and never give up. You'll eventually succeed.