I second the shake-down trip
[QUOTE=AKThumper;866102]I might practice setting up the tent once or twice prior to the rally trip....[/QUOTE]
Do this well before the start of your big trip. It will give you a much better idea of how to pack your stuff on your bike, how well or badly the stuff you've got works, what's missing, what's extraneous and how long it will take you to make and break camp.
An LED headlamp is almost essential.
Note that there is no standard between companies for sleeping bag ratings. Ratings assume that you are within a tent or other shelter and are on top of a sleeping pad. Many people are "cold" or "warm" sleepers, meaning they need more or less insulation than the average person. Knowing which you are will help in the choice of a bag. Down is lighter, packs smaller and will last longer than synthetic for a given rating. It will also cost you more.