For a lot of guys coming straight from instructing and no part 121, just because you CAN upgrade at 1000 hours or 12 months etc, doesn’t always mean you should or that you will be ready. It will take you about a year before you are completely comfortable with the airplane and almost another year to start thinking like a Captain and feel confident enough to ‘run the show’. YX has had almost 50% failure rate for upgrades last fall because people weren’t ready. Don’t make the jump until you feel 100% confident.