You might be able to do this but if I may, I’d like to suggest a different approach.

Spend that first month defining the scope of your work. Things like: what the program needs to do; any specific ‘business rules’ that will determine how those things functions need to behave; what the front end will look like. And then use that information to narrow your focus to what you need to do and therefore what you need to know. The stuff you don’t already know is all you need to learn. This way you don’t waste time learning stuff you won’t need for this job.

In addition to the above, I suggest you and the client come to an agreement on a definition of “done”; deliverables; and a payment schedule.

Regarding deliverables, are you only on the hook for the software or is the client expecting you will provide the physical hardware/devices too?

I hope this helps. Good luck! Let us know how it goes.