How early? When I had to get up at 5, it just sucked no matter what. At 7? Just do it for a couple of weeks until you can be sleepy at 11pm, it will work itself out.
Sure, but it's certainly the first thing to try. Get up when you need to, go to bed when you get sleepy. And I do think there is some "7:00" for everyone, some earliest time that can feel good, unless you have a literal sleep disorder, in which case asking the internet doesn't seem like the best strategy.