Bruce,
Replacing the main sail is a very easy task. You are correct to remove the  
boom. The trick to the whole thing is to get the correct number of wraps back 
on  the furling line before you raise the mast. Try retrieving and letting out 
the  main sail while still lowered. Do it several times to make sure the wraps 
are  correct. Other than cleaning the round bearings with mile soap and 
water, there  isn't much to do. I like to spray a liberal amount of WDS-40 when 
putting it all  back together.
 
Rummy



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