If the boat hasen't been used for a while the sail track can get a build up of sand, spiderwebs and snails which all make it tiring to push the main up. You can drag a scouring pad up the mast slot with soapy water to clean it. If you run out of puff pushing the sail up ensure you have the sail dead down wind when shes going up and when you want a rest pull the mast rotator to stop the sail going down. It is fiddly to get right but then it is perfect