I don't know to much , am not the brightest light bulb in the pack and have been said to be a card short of a full deck so bear with me on this thought. :roll:
A weight lifter does not start with the 250 pound weights but with something lighter. A long distant runner starts out with short distances and eventually works up to the desire goal. Neither of them start at there goal but at less and works up to there goal.
Why not do the same with paddling , especially if you have not paddled long distances in the past. Don't start with having to do X number of miles but only the ones that are comfortable and work up from there.
There are bugs to be worked out , both with the boat , the gear and the persons or yourself. Use that time to do a shorter , comfortable , distance , working the bugs out , getting acclimated to the trip , paddling and the (I hate this word ) routine of the trip.
Before you know it you get the feel for the river , the boat , the paddling , setting up camp , preparing the meals and are able to go all day without any adverse effects. All of of it just slips into a grove and becomes commonplace or normal. Chances are the distance paddled each day will become greater and easier as the time on the river passes on.
Personally for me it use to be , the 1st day on the water it was ... Go For It. The 2nd day .. things are slowed down and from the 3rd day on everything increases and is easier.
Now days ........the 1st day , it is take it easy , the 2nd day a little more and the 3rd day ... go for it.
"O" Well .. :roll: .. that information and $.50 won't even get you a cup of Coffee. See , like I said at the top , not the brightest and now you even found out that I am also cheap. Anyone else would of said a buck. :lol:
This might help you......
http://www.neilbank.com/phpBB2/viewtopic.php?t=1136 Then click on the link in aub77 post.
Chuck.
PS. Going all the way down to Cajun Country , a picture of some Gumbo on the bow might be a good incentive as you paddle along/down the mighty Miss. Each stroke gets you that much closer to that Gumbo.