I've just bought a sharpening kit and some lapping fluid. The kit has a 400 grit diamond plate, a 1000 grit diamond plate and an 8000 grit ceramic plate. I've watched numerous YouTube videos about sharpening, and the principles explained seem perfectly straightforward, but after several hours of practice with 4 different sized chisels (30mm to 6mm) working both with and without a honing guide, I have yet to achieve the stage where I can sharpen a chisel or my penknife to a sharpness where I can shave hairs from my arm or cut a sheet of printer paper without it leaving a jagged torn edge. Any advice or thoughts would be helpful.