scbafreak wrote: The one thing I will not
know at that point is how long each task will take.

You will have to be the best judge of how long it will take YOU to do
each task. Do you have the right tools, the experience, the abillity
to stay on task, the schedule to allow for long periods of work vs.
short broken periods, lots of friends to help? These are all questions
that you have to consider. Then once you've arrived at your best
estimate double it, then add 50% more for safety factor, then you may
have a reasonable estimate if you work hard and don't take any time
off.

Here's the answer to your questions though- you either have to built a
boat, in which case the rest of it doesn't matter and you will do what
it takes to build it, or you don't have to and you will get mired down
in worries about how much it's costing you, how little time you have
left for a social life, how hard it is, how your dad wants his cement
pad back, how your friends are all making gobs of money while you're
sitting there trying to figure out why the heck you put the decking on
before you fitted the bunks and cabinetry, etc., etc.