Some questions to answer for yourself.
Why are you riding?
Are there poor weather alternatives? Will you ride in poor weather? What is poor weather?
Will you ride in the dark? What if it gets dark?
Can you fix a flat? Will you learn? What about other repairs?
If you have a catastrophic failure, do you have a friend who can pick you up?
What if you need to take the bike to a shop? Do you know a local bike shop? They'll probably be willing to speed up repair time if they know you depend on the bike for a 20 mile commute.

20 Miles is not horribly challenging, although it might seem like that if you are not used to being on a bike much. However, the logistics of getting your pink little body to and from a location 20 miles away using only a bike can be challenging. That's the point of this whole forum.

Can you do it? Yes.

Will you succeed in it over time? That is a question only you can answer. Think hard on that. Think much harder about that than about your bike purchase. If you answer incorrectly, you will waste 800 bucks.