Then why all the brouhaha about not seeing yourself while messing with time, if this is doable?
Why, to ensure that nobody else does it! The brouhaha could easily have been stirred up by Voldemort himself through any number of means in order to further restrict the Good Guys' options.
Of course, it could have been stirred up by the first wizard to discover the power of working with yourself, and it's been passed down for so long that it's accepted without question, and Voldemort was either mad or foolhardy to have ignored the dire warnings. It just so happened that the dire warnings were wrong - Voldemort is incentivised not to correct them.
- This thread has run its course. You will find newer threads in the discussion section.
Another discussion thread - the fourth - has reached the (arbitrary?) 500 comments threshold, so it's time for a new thread for Eliezer Yudkowsky's widely-praised Harry Potter fanfic.
Most of the paratext and fan-made resources are listed on Mr. LessWrong's author page. There is also AdeleneDawner's collection of most of the previously-published Author's Notes.
Older threads: one, two, three, four. By tag.
Newer threads are in the Discussion section, starting from Part 6.
Spoiler policy as suggested by Unnamed and approved by Eliezer, me, and at least three other upmodders:
It would also be quite sensible and welcome to continue the practice of declaring at the top of your post which chapters you are about to discuss, especially for newly-published ones, so that people who haven't yet seen them can stop reading in time.