Over summer we participated in YC's Startup School. I'd participated with another startup before & even though it was a bad match for YC (non-software, non-tech, not-high-growth) I credit being able to finish product development for CR to participating in this program.
There's just something about being part of a community of entrepreneurs struggling and building. The weekly accountability helped a lot. What we achieved in this period is defining the formula for our main product (liquid chalk), but also, almost as important: convincing ourselves that going all the way towards defining a full skincare product line-up was feasible.
Pretty much all product development work for Chalk Rebels was done in this intense 8-week period. Graduated from YC Startup School in September.