What are your biggest challenges as an early stage founder?

I think distribution and generating leads are the hardest at this stage. It's a vicious cycle where prospects want to see testimonials so it's hard to convince them before you actually have a client base. Once you get the first few clients, you can get their feedback and use it to convert future prospects. Also, considering how organic distribution is very much dying (social media reaches have been steadily lower and there's a pressing need to invest in ads), building a community without investing in paid promotion is a challenge.

understanding how to market effectively is a huge challenge for us as we are both more more technical leaning than sales oriented. This has been a change we have made, with one of us trying to learn and own that function so that some expertise can acrue

I guess the biggest challenge is to choose the right battle... What's the priority of the day is the hardest question each morning.

The right problem to solve. I would say that is pre-early stage :)

To go past your Early Adopters so that you can Scale Up without being disturbed by competition

We are constantly planning to launch the product on the foreign market. Application? Mission Impossible. The competition is fierce, but we are not giving up.

There so many topics that have early been mentioned but I didn't see product market fit. Customers are floating in pockets and finding the pocket where you customers are is one of the biggest challenge. Especially now more than ever where people are in several different communities and getting their attention is tough. It's from here that I feel startups start getting their first early adopters and things start to roll forward.