before you start changing your glowplugs, i had this problem too. it is easy to say thatthe glow plugs are the culprit. before anything else, try doing this first in the morning...
when waiting for the glowplugs to turn green, you should hear a click then start the engine, if you don't hear the click, that could be the culprit for you hard starting, it is a broken relay in you ignition....it is relatively cheap, hard to explain but an electrician can fix it at a cheap price. so before you go buying 4 pcs of new glow plugs at 1000 a pc. do my suggestion first...
