The formula for greased landings on hard surface is to have the place where the rubber hits the runway at an angle of 15 degrees in front of vertical as measured from the CG. This is for tail draggers. For grass the wheels will need to be a little bit more forward or the airplane will tip over when it stops. For trike gear, have the nose sitting down a hair when at rest and have the rear wheels not far back of the CG. All the practice won't help much if your landing gear is in the wrong place.