whenever I think I am almost done with coding something, and go like "yeah, I can totally finish this the next day within just a few hours. Just add 1-2 functions and done" - it ends up being the opposite. I either realize how many things I didn't think and implement through and end up adding lots of things or I come up with a different approach to things which seems better and have to rework half my stuff...
I guess this will get fixed with experience.
Until then, I guess I'll keep trolling myself.