No pressure relief valve in the center of the lid in your cornies? Wow...
-Rack to sanitized keg - Yes
-Pressurize to 30 psi and roll or shake for a few minutes no
(...if you are in a pinch you can do that, but the best way to force carb your beer is to pressurize to your desired volume (ie. 12psi) and leave it alone for two weeks before touching it, but it will be even better around 3 weeks. There are many chemical reactions that take place within the beer once the co2 is applied, and it only gets better after 2-3 weeks.)
-Release the pressure - unnecessary if you leave it alone for 2-3 weeks.
-Store the keg at 30 psi over night - again, unnecessary if you practice the set it and forget it method
-Reduce to desired psi and drink - once again, not necessary if you plan far enough in advance.
IMO leaving it alone to carb for the minimum of 2 weeks will ensure the proper carbonation level, w/o problems whatsoever, a little planning can eliminate having to shake, rattle, and roll if you will.