My way is to do the following:

1) Break things up into small chunks and then check off and reward yourself as at all chunks (somewhat as your suggested instead of let’s do this 30 page writing, let’s write one page at a time).

And to keep motivated

2) Assume you’ll reach your goal fast. Stop thinking you’re business will be successful in 10 years later. Instead, hope to have a sustainable business within 1 year and X revenue in 2 (I don’t know why this is the case, but you’re mindset and actions completely change.

3) When you start, measure by how hard you work versus how much you accomplish. I know some people won’t agree, but I find if you start immediately on your accomplishments you get discouraged.
You will have to move past this stage eventually. But don’t pressure yourself: you’re hard work will pay off.
A side effect of this is that you won’t be as tempted to give you (e.g. measure by your results could quickly make you think “oh, this isn’t work, so I might as well just quit),

And to entrepreneurs: don’t worry, worst comes to worst, your business is proof that you work hard to future employers. And that’s worst outcome.

(Hope I didn’t sidetrack too much ). All the best!