Being prepared only increases the likelihood you'll be moved up. Don't go in and tell a surgeon you have only been full-time a few months. Turn in the psychiatrist letters when you schedule a surgery. Don't go in and demand you be moved up because you heard you can get moved up. That's just not a good diplomatic move.
Some people seem to find that having a hypothetical date set up is reassuring or validating.
These sorts of rewards for setting a date make it tempting for some to set a date just to look like they really are serious about this. For some, it can also be incentive to get money or letters together by that date. After all, it's hard to hit a target that doesn' t exist. However, you risk major disappointment and embarrassment if you are unable to make the date. This puts a lot of unnecessary stress on some people and may not be the best way for you.