Regardless of the stage you are in, there is always an opportunity to progress.
In the book beautiful constraint, the authors stated that we progress through these stages:
Do I believe it is possible? - That's my mindset
Do I know how to start to do it? - That's my method
How much do I want to do it? - That's my motivation
How ambitious are you? There are three stages of problem-solving:
1. Victim: Someone who lowers their ambition when faced with constraint.
2. Neutralizer: Someone who refuses to lower their ambition but finds a different way to deliver the aspiration instead.
3. Transformer: Someone who finds a way to use a constraint as an opportunity, possibly increase their ambition along the way.
These are not three kinds of people, but three stages that problem-solvers go through - even the most talented and experienced. If we tend to react one way to the imposition of a constraint initially, we need not see this as fixed and final. We all have the potential to move from victim to neutralizer to transformer.
To be good at problem-solving, you need to articulate the problem you are trying to solve very clearly, and constraints are the key parameters of that definition.
Whenever you are presented with one of these challenges that potentially are crippling for your project, you say no. You go back to the big idea. You go back to the belief. You go back to what got you to work on this in the first place.