Onegai shimasu (おねがい します) 🙇
There is a moment in every project, whether its writing a book, making a game, or creating a film, where you've had enough! Everything looks bad! Nothing is working! This thing sucks! I stink at this! That is the 85% mark. The Ugly Phase.
At this point you've spent a lot of time, maybe with others, on whatever it is. You're getting tired of it. It does not look good or feel right because you've spent a ton of power on it and it's not done. If you have coworkers you are probably getting sick of them, too! This is where you really see all the perceived flaws because it's not complete. This is the hardest part of any project to get past.
I've seen it happen. Where someone will abandon the project at this point, vowing never to return. There is no getting around it, the Ugly Phase. All you can do is find support with others, like your teammates, and do your best to keep moving. I recommend keeping things that you made at the beginning of the project to see how far you have come. If its your studies, keep you first assignment, and cringe as to how bad it is compared to what you have now. It will get better so long as you hod on and do your best to work through it.
Remember that its OK to feel these things. We're only human. Go and let off steam. What you should not do is bring others down. That will come back around to haunt you eventually.
Once you get past the 90% mark you will start to see the end in sight and hope will return. The project is almost complete. Others will see the end as well and that will help encourage you to finish.
The relief, and rewards, will always be worth it. And then you get to do it all over again 😈