Free Will and Time travel

[Scott]

No: HPFGUIDX 1342

-In all the books that I've read which involved time travel most left 
my brain totally muddled and with a million questions.  With that 
said I will now attempt to confuse all of you with my thoughts on the 
matter.

In PoA Harry n' Hermione couldn't have gone back and changed the 
course of events (i.e. stolen the cloak from Snape etc...) because 
then they would ALREADY of felt the reprecussions of it. I've read 
books where the people go back and change the past which then in turn 
(when they return to the present) changes the present. But JKR's 
ideas make much more sense because if you did it in the past then the 
changes would of taken effect then and not after you finished doing 
them because in reality you'd already be finished doing it before you 
knew you were going to start....

Sorry! As I read over this it makes very little sense.  Don't you 
wish you had a time turner so you never had to read this post!

Scott