If you're in debt with someone.. pay him, pay him even if the payment is not yet complete. Pay him a little if you can only pay little and apologize to him because you can't give the full payment, then pay him again once you have money, pay him little again if it is all you can pay. Don't stop paying, it doesn't matter if it is incomplete for as long as you are keeping it running. The one who lends you money will be even happy for you because you are paying and you are showing him that you are serious. It is better to give something little than to give totally none.
If you have a project, a big big project and you got overwhelmed because it takes a lot of time to finish it... just do something, dissect it, just do the parts that you can do and never stop. You can't finish it all at once, it doesn't matter if it is not yet complete. Just keep it running, keep doing something for it.
Because you can always complete it in the long run, you can always finish something if you are consistent and not stopping. A lot of people wants everything to be complete so fast that is why they are always getting frustrated once they can't see the completion. Life and success is all about patience and continuity. Never rush something if you can't do it right away, never look for completion because it will only frustrate you and will make you quit. Just keep something running and do something to make the momentum alive, never kill it, never stop it.