Density,listen to Centauris,he is a very capable instructor,but I would add one more thing.Before going into the sim prepare yourself by flying the lounge room.Make it real time,and go thru the sequences again and again.If you lose concentration even near the end of the imagined sequence,start again.Even use your hands so they are also part of the exercise.Its always been a help in the hundreds and hundreds of the bloody things ive done.