Pressure washer works best but you need to be careful. I used a electric pressure washer that's not strong enough to do any damage. A gas washer can cut the boat in half, in fact I splintered a hole in a 2x6 using one. As long as you can remove the splash guard working with the boat on the trailer seems to present no problems. Takes about 4 month after cutting holes to get the boat dried out enough to do fiberglass work. I kind of pushed faster on the one I'm completing now. I started in the spring and am mostly done, smashed keel, broken bow and all that. I only worked on it on weekends so that's about how long the hull takes. Probably another 2 months of winter weekends to make a rudder/centerboard from scratch and find the parts on e-bay.