Rarely will you acquire a sailboat in a turnkey state.  Even new boats require setting up for ease of use, safety, additional equipment and after sailing them more modifications.  If you take up this activity and want to pursue it, a lot of thoughtful changes will make it easier.  If you sail in a group and attend regattas, ideas on boat modifications, will be traded around.  It may take a few years to get a boat set up for travel, easy setup and take down, competitive and repaired.  A lot of used boats will require a lot of replacement of ropes, worn out cleats and lots of other things.  Most used trailers have never had anything done to them since they were bought new.  Lighting, bearings, boat bunks, storage boxes if there is one, tires, safety chains, couplers may need to be fixed, replaced or attended to in some way.

Rejuvenating an old fiber-glass boat can be a cost effective way to get into sailing.  New sailboats may have advantages worth the price you would have to pay.  If buying new check out the price of the boat but don't forget to add the cost of a trailer and additional necessary accessories like a dolly, clothing, storage box,  etc.  Newer used may also be a bargain as the boat is likely still in. production and parts will be readily available.

Look for on You tube for "Seaspray Catamaran Improvements" for more improvement videos like the one above.  Not an academy performance but fairly thorough study on improving a Seaspray.

Seaspray catamaran hulls opened up to remove waterlogged foam, replace rotted transom wood with aluminum plate, install rudder blade downhaul tube, repair any inside damage, re-attach deck to hull, install traveller transom stainless steel straps and generally improve the boat's useability, improve the boat's sailing performance and reduce setup/takedown time.  The hull deck joint was split using a cutlery knife and small hammer and this was done in sections so as to make the job simpler and easier. 

Most Seasprays were built with single skin fiberglass which makes them easy to repair or improve.  Some later models were built with a foam sandwitch core and luckily they are very well made with little evidence of delamination of the fiberglass layers from the foam.   This is not the case with many other catamaran types so if you are in the market for older Hobies, most Nacra models, etc you definitely want to check out the hulls for evidence of delamination.  It can sometimes be extensive and should be a deal breaker.