If you can stand yet one more post I have a simplified version I have used to explain it. There is an end point that will happen in the world but you have a choice about how you will be a part of it. For example, your friend wants a slurpee and you don’t feel like she deserves it. But Hashem wants her to have it. So you tell her no, and walk away. Then she goes to school and her teacher surprises the class with slurpees. And you lost your chance to do chessed because you chose not to, but she still got what she deserved.
Also, if your mom knows you REALLY well, she can offer you two things and know EXACTLY what you will chose. But that will not affect your choice. The better she knows you, the more accurate she will be. And considering Hashem knows us so thouroughly, our paths become obvious to Him. But we still choose.
The book I am reading now has a chapter on this and says that someone (I never remember who) says that bechira only exists at the point in which you are being tested. Picking a flavor ice cream is not bechira, but deciding whether or not to do something when your yetzer hora is fighting you is bechira.
I know longer posts don’t always get read but I chose to try to be helpful anyway 🙂