Can,t believe iv,e read some of these methods , !! thing to remember is to try and stay safe and not damage the boat , so jack the trailer with the boat still on it (that way any failure during jacking will just be like driving over a bump ) when you reach a reasonable height block the rear of the boat (past the end of the trailer of course) , lower the jack ! now pull the trailer out from the front ,once the trailer is 2/3rds jack and block the boat again , job done , make sure your blocks stop any rocking side to side (basically same as letting air out of tyres but gives you lots more than 2") trolley jack is best but I have done it with my 1 1/2 ton sports boat with a scissor jack ,much safer as while jacking your protected by the trailer
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