Here .. Pull this
Join Date: Jan 2007
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There isn't a whole lot to it really, but it depends on your level of confidence and how risk averse you are. Certainly the easiest thing to do is to hire someone, and watch and ask questions while they do it.
If you are more of a learn-by-doing person, then grab a book and a gauge and have at it. Do some online research to determine whether or not your mast is supposed to set with some rake or not. I am not sure how many spreaders the C27 has - I am assuming it's not a diamond spreader rig 'cause they're a little more complicated - but basically you want the stays and shrouds to be tight enough to hold the mast in place, but not so tight that they stress the hull unduly. If you get the fore and aft too tight, you will bend your boat, and if you get the side to side uneven, you're going to have a bent mast and it will sail a little strangely...
Depends on how deep your pockets are and how much patience you have...