Ok you need about 4 water buckets 32 TNT a 64 pile or more of redstone and a shovel ok!

Find a spot and dig a Square each side must be 3 blocks long and make sure no blocks are in the square in the middle pour water now build 3 other squares but Skip 3 blocks do not skip 3 block that are like this ------ Straight to you skip them in a row like this | a long line then do that for the rest just like the first one and now! put a pressure plate in the middle of the squares and add tnt to them do not add where the water is flowing that would be bad. now use your redstone to link all of the tnt to the pressure plate so make sure you get all tnt with redstone! if you have followed these steps you shall have succsefully made a Player Launcher now step on the pressure plate and JUMP but stay on the pressure plate. WARING HOW HIGH YOU GO RESULTS MAY VARY HIGHEST YOU CAN GO 127 BLOCKS ABOVE THE GROUND.