It's incredibly trippy to alter the past.
Basically, you have this memory, and you recall it just about every day.
At some point, you decide to erase it.
Then you go months, even years, without remembering it even once. The triggers that used to trigger the memory just don't trigger it anymore. Nothing reminds you of it until somebody actually mentions it very specifically. (Or you talk about memory wipes you've done to yourself, and suddenly you remember
And then when you to try to tell people that same event which you had perfect memory of and could recall everyday?
You can barely remember it. It's fuzzy, like a dream, or a fantasy. It's like it never happened.
It's really, really amazing.